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Service members and veterans face some different health issues from civilians. Their families also face some unique challenges. Families may have to cope with - Separation from their loved ones - Anxiety over loved ones' safety in combat zones - Illnesses and injuries from combat, including disabilities ...
These resources address the diagnosis or management of cold-induced sweating syndrome: - Gene Review: Gene Review: Cold-Induced Sweating Syndrome including Crisponi Syndrome - Genetic Testing Registry: Cold-induced sweating syndrome 1 - Genetic Testing Registry: Cold-induced sweating syndrome 2 - Merck Manual Consu...
How is brachydactyly type B inherited? Brachydactyly type B is caused by mutations in the ROR2 gene. It is inherited in an autosomal dominant fashion, which means one copy of the altered gene in each cell is sufficient to cause the disorder. Individuals with brachydactyly type B have a 50% chance of passing on this con...
These resources address the diagnosis or management of sensorineural deafness and male infertility: - Cleveland Clinic: Male Infertility - Gene Review: Gene Review: CATSPER-Related Male Infertility - Genetic Testing Registry: Deafness, sensorineural, and male infertility - MedlinePlus Health Topic: Assisted Reprodu...
Mutations in the GPC3 gene are responsible for some cases of Simpson-Golabi-Behmel syndrome. This gene provides instructions for making a protein called glypican 3, which is involved in the regulation of cell growth and division (cell proliferation). Researchers believe that the GPC3 protein can also cause certain cell...
Dihydropteridine reductase deficiency (DHPR) is a severe form of hyperphenylalaninemia (high levels of the amino acid phenylalanine in the blood) due to impaired renewal of a substance known as tetrahydrobiopterin (BH4). Tetrahydrobiopterin normally helps process several amino acids, including phenylalanine, and it is ...
Foot drop describes the inability to raise the front part of the foot due to weakness or paralysis of the muscles that lift the foot. As a result, individuals with foot drop scuff their toes along the ground or bend their knees to lift their foot higher than usual to avoid the scuffing, which causes what is called a st...
Pfeiffer syndrome results from mutations in the FGFR1 or FGFR2 gene. These genes provide instructions for making proteins known as fibroblast growth receptors 1 and 2. Among their multiple functions, these proteins signal immature cells to become bone cells during embryonic development. A mutation in either the FGFR1 o...
What are the symptoms of brittle diabetes? The main symptom of brittle diabetes is severe instability of blood glucose levels with frequent and unpredictable episodes of hypoglycemia and/or ketoacidosis that cause a disruption of daily activities. Three clinical presentations have been described: Predominant hyperglyce...
Is Cushing's syndrome inherited? Most cases of Cushing's syndrome are not inherited. However, Cushing's syndrome rarely occurs in inherited conditions characterized by the development of tumors of one or more endocrine gland. These conditions may include: Primary pigmented micronodular adrenal disease, in which childre...
These resources address the diagnosis or management of HMG-CoA lyase deficiency: - Baby's First Test - Genetic Testing Registry: Deficiency of hydroxymethylglutaryl-CoA lyase These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests - Dr...
How might juvenile myoclonic epilepsy be treated? Avoidance of precipitating events such as alcohol use and sleep deprivation may be useful but is not sufficient to control the seizures of juvenile myoclonic epilepsy. Medical therapy with anticonvulsants is typically needed and well tolerated. The majority of patients ...
Scientists think that IgA nephropathy is an autoimmune kidney disease, meaning that the disease is due to the bodys immune system harming the kidneys. People with IgA nephropathy have an increased blood level of IgA that contains less of a special sugar, galactose, than normal. This galactose-deficient...
Encephaloceles are rare neural tube defects characterized by sac-like protrusions of the brain and the membranes that cover it through openings in the skull. These defects are caused by failure of the neural tube to close completely during fetal development. The result is a groove down the midline of the upper part of ...
Mutations in the BMPR1A and SMAD4 genes cause juvenile polyposis syndrome. These genes provide instructions for making proteins that are involved in transmitting chemical signals from the cell membrane to the nucleus. This type of signaling pathway allows the environment outside the cell to affect how the cell produces...
A heart attack occurs when the supply of blood and oxygen to an area of the heart muscle is blocked, usually by a blood clot in a coronary artery. If the blockage is not treated within a few hours, the heart muscle will be permanently damaged and replaced by scar tissue.
Romano-Ward syndrome is a condition that causes a disruption of the heart's normal rhythm (arrhythmia). This disorder is a form of long QT syndrome, which is a heart condition that causes the heart (cardiac) muscle to take longer than usual to recharge between beats. The irregular heartbeats can lead to fainting (synco...
Most cases of combined pituitary hormone deficiency are sporadic, which means they occur in people with no history of the disorder in their family. Less commonly, this condition has been found to run in families. When the disorder is familial, it can have an autosomal dominant or an autosomal recessive pattern of inher...
The inheritance pattern of Ehlers-Danlos syndrome varies by type. The arthrochalasia, classical, hypermobility, and vascular forms of the disorder have an autosomal dominant pattern of inheritance. Autosomal dominant inheritance means that one copy of the altered gene in each cell is sufficient to cause the disorder. I...
The more premature an infant is and the lower his or her birth weight, the greater the risk of bronchopulmonary dysplasia (BPD). Most infants who develop BPD are born more than 10 weeks before their due dates, weigh less than 2 pounds (about 1,000 grams) at birth, and have breathing problems. Infection...
Approximately 350 people with succinic semialdehyde dehydrogenase deficiency have been reported worldwide.
What causes hemifacial microsomia? For most people with hemifacial microsomia, the cause is unknown. It is believed that something occurs in the early stages of development, such as a disturbance of the blood supply to the first and second branchial arches in the first 6 to 8 weeks of pregnancy. Studies have suggested ...
Agnosia can compromise quality of life.
MyD88 deficiency is caused by mutations in the MYD88 gene, which provides instructions for making a protein that plays an important role in stimulating the immune system to respond to bacterial infection. The MyD88 protein is part of a signaling pathway that is involved in early recognition of pathogens and the initiat...
These resources address the diagnosis or management of dopamine beta-hydroxylase deficiency: - Gene Review: Gene Review: Dopamine Beta-Hydroxylase Deficiency - Genetic Testing Registry: Dopamine beta hydroxylase deficiency - Vanderbilt Autonomic Dysfunction Center These resources from MedlinePlus offer information...
How might Liddle syndrome be treated? Treatment for Liddle syndrome includes following a low sodium diet as well as taking potassium-sparing diuretics, which reduce blood pressure and correct hypokalemia and metabolic alkalosis. Conventional anti-hypertensive therapies are not effective for this condition. With treatme...
What are the signs and symptoms of Isolated ACTH deficiency? The Human Phenotype Ontology provides the following list of signs and symptoms for Isolated ACTH deficiency. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Med...
Mutations in the AGA gene cause aspartylglucosaminuria. The AGA gene provides instructions for producing an enzyme called aspartylglucosaminidase. This enzyme is active in lysosomes, which are structures inside cells that act as recycling centers. Within lysosomes, the enzyme helps break down complexes of sugar molecul...
CARASIL appears to be a rare condition. It has been identified in about 50 people, primarily in Japan and China.
A sacrococcygeal teratoma is a tumor that grows at the base of the spine in a developing fetus. It occurs in one in 40,000 newborns and girls are four times more likely to be affected than boys. Though it is usually benign, there is a possibility that the teratoma could become malignant. As such, the recommended tre...
Recovery from RS is directly related to the severity of the swelling of the brain. Some people recover completely, while others may sustain varying degrees of brain damage. Those cases in which the disorder progresses rapidly and the patient lapses into a coma have a poorer prognosis than those with a less severe cours...
- Hepatitis C is a virus, or infection, that causes inflammation of the liver. - Anyone can get hepatitis C, but some people are more likely to than others. - You could get hepatitis C through contact with an infected persons blood. - Most people do not have any symptoms until the hepatitis C virus causes liver dama...
At first, open-angle glaucoma has no symptoms. It causes no pain. Vision seems normal. Without treatment, people with glaucoma will slowly lose their peripheral, or side vision. They seem to be looking through a tunnel. Over time, straight-ahead vision may decrease until no vision remains.
The NINDS supports an extensive research program of basic studies to increase understanding of diseases that affect the brain, spinal cord, muscles, and nerves. This research examines the genetics, symptoms, progression, and psychological and behavioral impact of diseases, with the goal of improving ways to diagnose, t...
What are the signs and symptoms of Transposition of the great arteries? The Human Phenotype Ontology provides the following list of signs and symptoms for Transposition of the great arteries. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can u...
When LCH is caused by mutations in the RELN gene, the condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show sign...
DOLK-congenital disorder of glycosylation (DOLK-CDG, formerly known as congenital disorder of glycosylation type Im) is an inherited condition that often affects the heart but can also involve other body systems. The pattern and severity of this disorder's signs and symptoms vary among affected individuals. Individual...
These resources address the diagnosis or management of X-linked SCID: - Baby's First Test: Severe Combined Immunodeficiency - Gene Review: Gene Review: X-Linked Severe Combined Immunodeficiency - Genetic Testing Registry: X-linked severe combined immunodeficiency - MedlinePlus Encyclopedia: Immunodeficiency Disorde...
Prosopagnosia can be socially crippling. Individuals with the disorder often have difficulty recognizing family members and close friends. They often use other ways to identify people, such as relying on voice, clothing, or unique physical attributes, but these are not as effective as recognizing a face. Children with ...
Bradyopsia can be caused by mutations in the RGS9 gene or in the RGS9BP gene (which is also known as R9AP). These genes provide instructions for making proteins that are necessary for normal vision. The proteins are found in light-detecting cells in the eye called photoreceptors. When light enters the eye, it stimulate...
Periventricular heterotopia is a condition in which the nerve cells (neurons) do not migrate properly during the early development of the fetal brain from about the 6th week to the 24th week of pregnancy. Affected people typically develop recurrent seizures (epilepsy) beginning in mid-adolescence. Intelligence is gener...
Mutations in the SRD5A2 gene cause 5-alpha reductase deficiency. The SRD5A2 gene provides instructions for making an enzyme called steroid 5-alpha reductase 2. This enzyme is involved in processing androgens, which are hormones that direct male sexual development. Specifically, the enzyme is responsible for a chemical ...
Myasthenia gravis is disease that causes weakness in the muscles under your control. It happens because of a problem in communication between your nerves and muscles. Myasthenia gravis is an autoimmune disease. Your body's own immune system makes antibodies that block or change some of the nerve signals to your muscles...
What are the signs and symptoms of Familial prostate cancer? The Human Phenotype Ontology provides the following list of signs and symptoms for Familial prostate cancer. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Med...
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
Eating, diet, and nutrition have not been shown to play a role in causing or preventing primary hyperparathyroidism. Vitamin D. Experts suggest correcting vitamin D deficiency in people with primary hyperparathyroidism to achieve a serum level of 25-hydroxy-vitamin D greater than 20 nanograms per decil...
Nablus mask-like facial syndrome is a rare microdeletion syndrome that is characterized by a mask-like facial appearance. Facial features include narrowing of the eye opening (blepharophimosis); tight appearing glistening facial skin; and flat and broad nose. Other features include malformed ears; unusual scalp hair pa...
Chronic hepatitis C is a long-lasting infection with the hepatitis C virus. Chronic hepatitis C occurs when the body cant get rid of the hepatitis C virus. Most hepatitis C infections become chronic. Without treatment, chronic hepatitis C can cause liver cancer or severe liver damage that leads to live...
Several hundred cases of CDA have been reported worldwide. CDA type II is the most common form of the disorder, with more than 300 reported cases. CDA type III is the rarest form; it has been described in only a few families from Sweden, Argentina, and the United States. The incidence of CDA type I is unknown. Because ...
What causes Tietze syndrome? The exact underlying cause of Tietze syndrome is currently unknown. Some researchers have speculated that small injuries to the anterior chest wall may contribute to the development of the condition.
This condition is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In some cases, an affected person inherits the mutation from one affected parent. Other cases result from new mutations in the gene and occur in people with no histor...
Neurohypophyseal diabetes insipidus is thought to be rare, although its exact incidence is unknown. The acquired form occurs much more frequently than the familial form.
Autoimmune pancreatitis affects the pancreas, a gland behind the stomach and in front of the spine, and can also affect the bile ducts, salivary glands, kidneys, and lymph nodes. It is thought to occur when the immune system mistakenly begins to attack these healthy body tissues, glands, and organs. Common signs and sy...
These resources address the diagnosis or management of X-linked intellectual disability, Siderius type: - Cincinnati Children's Hospital: Cleft Lip / Cleft Palate Bottle Feeding - Cleveland Clinic: Cleft Lip & Palate Surgery - Genetic Testing Registry: Siderius X-linked mental retardation syndrome - Nemours Childre...
Desmoplastic infantile gangliomas (DIGs) are rare brain tumors that are normally located in the frontal or parietal lobes of the brain. They are usually diagnosed before 18 months of age with most infants presenting with a short duration of symptoms. Although seizures are not commonly observed, a bulging fontanelle, ra...
Hemochromatosis type 4 is a disease in which too much iron builds up in the body. This extra iron is toxic to the body and can damage the organs. Hemochromatosis is inherited in an autosomal dominant manner. It is caused by mutations in the SLC40A1 gene. Hemochromatosis may be aquired or hereditary. Hereditary hemochr...
Summary : After a serious injury, illness or surgery, you may recover slowly. You may need to regain your strength, relearn skills or find new ways of doing things you did before. This process is rehabilitation. Rehabilitation often focuses on - Physical therapy to help your strength, mobility and fitness ...
These resources address the diagnosis or management of Prader-Willi syndrome: - Gene Review: Gene Review: Prader-Willi Syndrome - Genetic Testing Registry: Prader-Willi syndrome - MedlinePlus Encyclopedia: Hypotonia - MedlinePlus Encyclopedia: Prader-Willi Syndrome These resources from MedlinePlus offer informati...
These resources address the diagnosis or management of Troyer syndrome: - Gene Review: Gene Review: Hereditary Spastic Paraplegia Overview - Gene Review: Gene Review: Troyer Syndrome - Genetic Testing Registry: Troyer syndrome - Spastic Paraplegia Foundation, Inc.: Treatments and Therapies These resources from Me...
Botulism is a rare but serious illness. The cause is a toxin (poison) made by a bacterium called Clostridium botulinum. It occurs naturally in soil. There are several kinds of botulism. Foodborne botulism comes from eating foods contaminated with the toxin. Wound botulism happens when a wound infected with the bact...
Oligoastrocytoma is a brain tumor that forms when two types of cells in the brain, called oligodendrocytes and astrocytes, rapidly increase in number to form a mass. These brain cells are known as glial cells, which normally protect and support nerve cells in the brain. Because an oligoastrocytoma is made up of a com...
Familial pityriasis rubra pilaris is a rare condition. Its incidence is unknown, although the familial form appears to be the least common type of pityriasis rubra pilaris.
These resources address the diagnosis or management of hereditary fructose intolerance: - Boston University: Specifics of Hereditary Fructose Intolerance and Its Diagnosis - Gene Review: Gene Review: Hereditary Fructose Intolerance - Genetic Testing Registry: Hereditary fructosuria - MedlinePlus Encyclopedia: Hered...
What are the signs and symptoms of Maturity-onset diabetes of the young, type 7? The Human Phenotype Ontology provides the following list of signs and symptoms for Maturity-onset diabetes of the young, type 7. If the information is available, the table below includes how often the symptom is seen in people with this co...
Hookworm is an intestinal parasite of humans. The larvae and adult worms live in the small intestine can cause intestinal disease. The two main species of hookworm infecting humans are Ancylostoma duodenale and Necator americanus.
What are the signs and symptoms of LCHAD deficiency? The Human Phenotype Ontology provides the following list of signs and symptoms for LCHAD deficiency. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Medical Dictionary ...
These resources address the diagnosis or management of PMM2-CDG: - Gene Review: Gene Review: PMM2-CDG (CDG-Ia) - Genetic Testing Registry: Carbohydrate-deficient glycoprotein syndrome type I These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagno...
What causes schwannomas? The cause of schwannomas is unknown. They sometimes occur in people with certain disorders including some types of neurofibromatosis (neurofibromatosis type 2 and schwannomatosis). In these cases, affected people have multiple tumors that are due to changes (mutations) in a gene. For example, n...
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
Gangliocytoma is a rare type of central nervous system (CNS) tumor made up of mature neurons. Gangliocytomas may occur in all age groups but most often occur in people between the ages of 10 and 30. The most common site is the temporal lobe of the brain, but they can arise anywhere in the CNS including the cerebellum, ...
These resources address the diagnosis or management of type A insulin resistance syndrome: - Genetic Testing Registry: Insulin-resistant diabetes mellitus AND acanthosis nigricans These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests ...
Acute leukemia gets worse quickly. In chronic leukemia, symptoms develop gradually and are generally not as severe as in acute leukemia.
Mutations in multiple genes can cause congenital fiber-type disproportion. Mutations in the TPM3, RYR1 and ACTA1 genes cause 35 to 50 percent of cases, while mutations in other genes, some known and some unidentified, are responsible for the remaining cases. The genes that cause congenital fiber-type disproportion pro...
The inflammatory myopathies are a group of diseases, with no known cause, that involve chronic muscle inflammation accompanied by muscle weakness. The three main types of chronic, or persistent, inflammatory myopathy are polymyositis, dermatomyositis, and inclusion body myositis (IBM). These rare disorders may affect b...
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
Your eyelids help protect your eyes. When you blink, your eyelids spread moisture over your eyes. Blinking also helps move dirt or other particles off the surface of the eye. You close your eyelids when you see something coming towards your eyes. This can help protect against injuries. Like most other parts of your ...
Mutations in the TAZ gene cause Barth syndrome. The TAZ gene provides instructions for making a protein called tafazzin. Tafazzin is located in structures called mitochondria, which are the energy-producing centers of cells. Tafazzin is involved in altering a fat (lipid) called cardiolipin, which plays critical roles i...
Moebius syndrome is a rare neurological condition that primarily affects the muscles that control facial expression and eye movement. Signs and symptoms of the condition may include weakness or paralysis of the facial muscles; feeding, swallowing, and choking problems; excessive drooling; crossed eyes; lack of facial e...
These resources address the diagnosis or management of spastic paraplegia type 15: - Gene Review: Gene Review: Hereditary Spastic Paraplegia Overview - Spastic Paraplegia Foundation, Inc: Treatments and Therapies These resources from MedlinePlus offer information about the diagnosis and management of various health...
How might multiple familial trichoepithelioma be treated? Several therapies have been used to treat multiple trichoepitheliomas, with variable results. A single trichoepithelioma may be treated with surgery. Cryosurgery or laser surgery may be used to remove multiple trichoepitheliomas. Imiquimod cream has also been...
Mutations in the ALDH3A2 gene cause Sjgren-Larsson syndrome. The ALDH3A2 gene provides instructions for making an enzyme called fatty aldehyde dehydrogenase (FALDH). The FALDH enzyme is part of a multistep process called fatty acid oxidation in which fats are broken down and converted into energy. Specifically, the FAL...
Men with breast cancer usually have lumps that can be felt.Lumps and other signs may be caused by male breast cancer or by other conditions. Check with your doctor if you notice a change in your breasts.
An acoustic neuroma is a benign tumor that develops on the nerve that connects the ear to the brain. The tumor usually grows slowly. As it grows, it presses against the hearing and balance nerves. At first, you may have no symptoms or mild symptoms. They can include - Loss of hearing on one side - Ringing i...
Pyogenic granuloma are small, reddish bumps on the skin that bleed easily due to an abnormally high number of blood vessels. They typically occur on the hands, arms, or face. While the exact cause of pyogenic granulomas is unknown, they often appear following injury. Pyogenic granuloma is often observed in infancy and ...
Chiari malformation type 1 is a structural abnormality of the cerebellum, the part of the brain that controls balance. It involves the extension of the lower part of the cerebellum into the foramen magnum (the large hole at the base of the skull which allows passage of the spinal cord), without involving the brainstem....
Most cases of Russell-Silver syndrome are sporadic, which means they occur in people with no history of the disorder in their family. Less commonly, Russell-Silver syndrome can run in families. In some affected families, the condition appears to have an autosomal dominant pattern of inheritance. Autosomal dominant inh...
In most cases, Stargardt macular degeneration is caused by mutations in the ABCA4 gene. Less often, mutations in the ELOVL4 gene cause this condition. The ABCA4 and ELOVL4 genes provide instructions for making proteins that are found in light-sensing (photoreceptor) cells in the retina. The ABCA4 protein transports po...
BOR/BO syndrome is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In about 90 percent of cases, an affected person inherits the mutation from one affected parent. The remaining cases result from new mutations in the gene and occur i...
Schwannomatosis is a rare form of neurofibromatosis that is primarily characterized by multiple schwannomas (benign tumors of the nervous system) in the absence of bilateral (affecting both sides) vestibular schwannomas. Signs and symptoms of the condition vary based on the size, location and number of schwannomas but ...
Dystrophic epidermolysis bullosa (DEB) is one of the major forms of epidermolysis bullosa. The signs and symptoms can vary widely among affected people. In mild cases, blistering may primarily affect the hands, feet, knees, and elbows. Severe cases often involve widespread blistering that can lead to vision loss, disfi...
Factor V Leiden is the most common inherited form of thrombophilia. Between 3 and 8 percent of people with European ancestry carry one copy of the factor V Leiden mutation in each cell, and about 1 in 5,000 people have two copies of the mutation. The mutation is less common in other populations.
How might chILD be treated? There is no single treatment for interstitial lung diseases in children. Different forms of chILD require different treatments and support depending on the condition. The goals of treatment for chILD is to relieve symptoms, provide support to maximize growth and development, and to prevent ...
These resources address the diagnosis or management of CHST3-related skeletal dysplasia: - Gene Review: Gene Review: CHST3-Related Skeletal Dysplasia - Genetic Testing Registry: Spondyloepiphyseal dysplasia with congenital joint dislocations These resources from MedlinePlus offer information about the diagnosis and...
What are the signs and symptoms of Cataract, total congenital? The Human Phenotype Ontology provides the following list of signs and symptoms for Cataract, total congenital. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus...
These resources address the diagnosis or management of spastic paraplegia type 8: - Gene Review: Gene Review: Spastic Paraplegia 8 - Genetic Testing Registry: Spastic paraplegia 8 - Spastic Paraplegia Foundation, Inc.: Treatments and Therapies These resources from MedlinePlus offer information about the diagnosis ...
Blood pressure rises as body weight increases. Losing even 10 pounds can lower blood pressure -- and it has the greatest effect for those who are overweight and already have hypertension. If you are overweight or obese, work with your health care provider to develop a plan to help you lower your weight and maintain a h...
The first symptoms of rabies may be very similar to those of the flu including general weakness or discomfort, fever, or headache. These symptoms may last for days. There may be also discomfort or a prickling or itching sensation at the site of bite, progressing within days to symptoms of cerebral dysf...
Retinochoroidal coloboma is an eye abnormality that occurs before birth. It is characterized by missing pieces of tissue in both the retina (the light-sensitive tissue lining the back of the eye) and choroid (the blood vessel layer under the retina). In many cases, retinochoroidal coloboma does not cause symptoms. Howe...
Mutations in several genes cause the different types of Stickler syndrome. Between 80 and 90 percent of all cases are classified as type I and are caused by mutations in the COL2A1 gene. Another 10 to 20 percent of cases are classified as type II and result from mutations in the COL11A1 gene. Marshall syndrome, which m...
The prevalence of familial restrictive cardiomyopathy is unknown. Although cardiomyopathy is a relatively common condition, restrictive cardiomyopathy, in which relaxation of the heart muscle is impaired, is the least common type. Some other forms of cardiomyopathy involve a weak or enlarged heart muscle with impaired ...