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About 1 in 6,250 babies are born with Horner syndrome. The incidence of Horner syndrome that appears later is unknown, but it is considered an uncommon disorder.
These resources address the diagnosis or management of renal tubular acidosis with deafness: - Genetic Testing Registry: Renal tubular acidosis with progressive nerve deafness - MedlinePlus Encyclopedia: Audiometry - MedlinePlus Encyclopedia: Kidney Function Tests These resources from MedlinePlus offer information...
People normally have 46 chromosomes in each cell. Two of the 46 chromosomes, known as X and Y, are called sex chromosomes because they help determine whether a person will develop male or female sex characteristics. Females typically have two X chromosomes (46,XX), and males have one X chromosome and one Y chromosome (...
If left untreated, tabes dorsalis can lead to paralysis, dementia, and blindness. Existing nerve damage cannot be reversed.
ARVC occurs in an estimated 1 in 1,000 to 1 in 1,250 people. This disorder may be underdiagnosed because it can be difficult to detect in people with mild or no symptoms.
Larsen syndrome is a condition that causes abnormal development of the bones. Signs and symptoms may include clubfoot and numerous joint dislocations at birth (affecting the hips, knees and elbows); flexible joints; and a distinctive appearance of the face, hands and feet. Larsen syndrome is inherited in an autosomal d...
These resources address the diagnosis or management of dentinogenesis imperfecta: - Genetic Testing Registry: Dentinogenesis imperfecta - Shield's type II - Genetic Testing Registry: Dentinogenesis imperfecta - Shield's type III - MedlinePlus Encyclopedia: Tooth - abnormal colors These resources from MedlinePlus o...
How is cold urticaria diagnosed? A diagnosis of cold urticaria is typically suspected based on the presence of characteristic signs and symptoms. Additional testing can then be ordered to confirm the diagnosis and determine if there are other associated conditions. This generally involves a cold simulation test in whic...
What are the symptoms of cat scratch disease? Most people with cat scratch disease have been bitten or scratched by a cat and developed a mild infection at the point of injury. Lymph nodes, especially those around the head, neck, and upper limbs, become swollen. Additionally, a person with cat scratch disease may exper...
Mutations in the COL7A1 gene cause all three major forms of dystrophic epidermolysis bullosa. This gene provides instructions for making a protein that is used to assemble type VII collagen. Collagens are molecules that give structure and strength to connective tissues, such as skin, tendons, and ligaments, throughout ...
5-alpha reductase deficiency is a condition that affects male sexual development before birth and during puberty. People with this condition are genetically male, with one X and one Y chromosome in each cell, and they have male gonads (testes). Their bodies, however, do not produce enough of a hormone called dihydrotes...
GLUT1 deficiency syndrome is caused by mutations in the SLC2A1 gene. This gene provides instructions for producing a protein called the glucose transporter protein type 1 (GLUT1). The GLUT1 protein is embedded in the outer membrane surrounding cells, where it transports a simple sugar called glucose into cells from the...
Certain factors affect prognosis (chance of recovery) and treatment options. The prognosis (chance of recovery) and treatment options depend on: - Where the tumor has formed in the central nervous system (CNS). - Whether there are certain changes in the genes or chromosomes. - Whether any cancer cells rem...
Donohue syndrome is estimated to affect less than 1 per million people worldwide. Several dozen cases have been reported in the medical literature.
Hereditary neuropathies are a group of inherited disorders affecting the peripheral nervous system. The hereditary neuropathies are divided into four major subcategories: hereditary motor and sensory neuropathy, hereditary sensory neuropathy, hereditary motor neuropathy, and hereditary sensory and autonomic neuropathy....
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.
Certain factors affect prognosis (chance of recovery and treatment options). The prognosis (chance of recovery) and treatment options depend on the following: - The type of cancer. - The size of the tumor. - The stage of cancer (whether it affects part of the ovary, involves the whole ovary, or has sprea...
If you have lupus, your immune system attacks healthy cells and tissues by mistake. This can damage your joints, skin, blood vessels and organs. There are many kinds of lupus. The most common type, systemic lupus erythematosus, affects many parts of the body. Discoid lupus causes a rash that doesn't go away. Subacute c...
Peripheral arterial disease (P.A.D.) is a disease in which plaque (plak) builds up in the arteries that carry blood to your head, organs, and limbs. Plaque is made up of fat, cholesterol, calcium, fibrous tissue, and other substances in the blood. P.A.D. currently affects millions of Americans, and about 1 in every 20 ...
Treatment is supportive and symptomatic. Individuals with the disorder often require tube feeding. Because COFS is genetic, genetic counseling is available.
Tremors are unintentional trembling or shaking movements in one or more parts of your body. Most tremors occur in the hands. You can also have arm, head, face, vocal cord, trunk, and leg tremors. Tremors are most common in middle-aged and older people, but anyone can have them. The cause of tremors is a problem in t...
If you have a balance disorder, you may stagger when you try to walk, or teeter or fall when you try to stand up. You might experience other symptoms such as - dizziness or vertigo (a spinning sensation) - falling or feeling as if you are going to fall - lightheadedness, faintness, or a floating sensation - blur...
Fragile XE syndrome is caused by mutations in the AFF2 gene. This gene provides instructions for making a protein whose function is not well understood. Some studies show that the AFF2 protein can attach (bind) to DNA and help control the activity of other genes. Other studies suggest that the AFF2 protein is involved ...
Niemann-Pick disease types A and B is caused by mutations in the SMPD1 gene. This gene provides instructions for producing an enzyme called acid sphingomyelinase. This enzyme is found in lysosomes, which are compartments within cells that break down and recycle different types of molecules. Acid sphingomyelinase is res...
How is familial isolated hyperparathyroidism diagnosed? The diagnosis of familial isolated hyperparathyroidism (FIHP) is primarily a diagnosis of exclusion. This means that it is diagnosed when no symptoms or genetic features of other forms of familial hyperparathyroidism are present. FIHP may be the only feature of an...
Is non-classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency inherited? Non-classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency (NCAH) is inherited in an autosomal recessive manner. This means that to be affected, a person must have a mutation in both copies of the responsible gene...
Multiple mitochondrial dysfunctions syndrome (MMDS) is a severe condition that affects the energy-producing structures of cells (called the mitochondria). Signs and symptoms of this condition generally develop early in life and may include encephalopathy, hypotonia (poor muscle tone), seizures, developmental delay, fai...
Histidinemia is an inherited condition characterized by elevated blood levels of the amino acid histidine, a building block of most proteins. Histidinemia is caused by the shortage (deficiency) of the enzyme that breaks down histidine. Histidinemia typically causes no health problems, and most people with elevated hist...
Osteoarthritis is the most common form of arthritis among older people. It affects hands, low back, neck, and weight-bearing joints such as knees, hips, and feet. Osteoarthritis occurs when cartilage, the tissue that cushions the ends of the bones within the joints, breaks down and wears away. This causes bones to rub ...
The treatment for nerve damage from diabetes is based on your symptoms. No treatment can reverse nerve damage; however, it can help you feel better. Your doctor might suggest taking low doses of medicines that both treat other health problems and help the pain of neuropathy. Some of these medicines include ...
Ascher syndrome is a rare condition characterized by a combination of episodic edemea or swelling of the eyelids (blepharochalasia), double lip, and nontoxic thyroid enlargement (goiter). The underlying cause of this condition is unknown. Most cases are sporadic, but familial cases suggestive of autosomal dominant inhe...
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.
Mutations in the HMGCL gene cause HMG-CoA lyase deficiency. The HMGCL gene provides instructions for making an enzyme known as 3-hydroxymethyl-3-methylglutaryl-coenzyme A lyase (HMG-CoA lyase). This enzyme plays a critical role in breaking down dietary proteins and fats for energy. Specifically, it is responsible for p...
Significant exposure to asbestos fibers causes asbestos-related lung diseases. "Significant" usually means you were exposed for at least several months to visible dust from the fibers. Asbestos fibers are very small. When you breathe in, they can get stuck deep in your lungs. The fibers remain in your ...
A congenital heart defect is a problem with the structure of the heart. It is present at birth. Congenital heart defects are the most common type of birth defect. The defects can involve the walls of the heart, the valves of the heart, and the arteries and veins near the heart. They can disrupt the normal flow of blood...
During the first three stages of diabetic retinopathy, no treatment is needed, unless you have macular edema. To prevent progression of diabetic retinopathy, people with diabetes should control their levels of blood sugar, blood pressure, and blood cholesterol. Proliferative retinopathy is treated with laser surgery. T...
Our understanding of central cord syndrome has increased greatly in recent decades as a result of research funded conducted by the National Institute of Neurological Disorders and Stroke (NINDS). Much of this research focuses on finding better ways to prevent, treat, and ultimately cure neurological disorders such as c...
Summary : MRSA stands for methicillin-resistant Staphylococcus aureus. It causes a staph infection (pronounced "staff infection") that is resistant to several common antibiotics. There are two types of infection. Hospital-associated MRSA happens to people in healthcare settings. Community-associated MRSA happens to peo...
Parry-Romberg syndrome is a rare disorder characterized by slowly progressive deterioration (atrophy) of the skin and soft tissues of half of the face (hemifacial atrophy), usually the left side. It is more common in females than in males. Initial facial changes usually involve the tissues above the upper jaw (maxilla)...
Trichotillomania is an impulse control disorder characterized by an overwhelming urge to repeatedly pull out one's own hair (usually on the scalp), resulting in hair loss (alopecia). The eyelashes, eyebrows, and beard can also be affected. Many affected individuals feel extreme tension when they feel an impulse, follow...
MELAS can result from mutations in one of several genes, including MT-ND1, MT-ND5, MT-TH, MT-TL1, and MT-TV. These genes are found in the DNA of cellular structures called mitochondria, which convert the energy from food into a form that cells can use. Although most DNA is packaged in chromosomes within the nucleus, mi...
Mutations in the B3GLCT gene cause Peters plus syndrome. The B3GLCT gene provides instructions for making an enzyme called beta 3-glucosyltransferase (B3Glc-T), which is involved in the complex process of adding sugar molecules to proteins (glycosylation). Glycosylation modifies proteins so they can perform a wider var...
Achromatopsia is a condition characterized by a partial or total absence of color vision. People with complete achromatopsia cannot perceive any colors; they see only black, white, and shades of gray. Incomplete achromatopsia is a milder form of the condition that allows some color discrimination. Achromatopsia also i...
Potocki-Shaffer syndrome (also known as proximal 11p deletion syndrome) is caused by a deletion of genetic material from the short (p) arm of chromosome 11 at a position designated 11p11.2. The size of the deletion varies among affected individuals. Studies suggest that the full spectrum of features is caused by a dele...
Lamellar ichthyosis is a condition that mainly affects the skin. Infants with this condition are typically born with a tight, clear sheath covering their skin called a collodion membrane. This membrane usually dries and peels off during the first few weeks of life, and then it becomes obvious that affected babies have ...
The National Institute of Neurological Disorders and Stroke (NINDS) conducts TSC research in its laboratories at the National Institutes of Health (NIH) and also supports TSC research through grants to major medical institutions across the country. Scientists in one study are learning more about the genes that can caus...
GM1 gangliosidosis is an inherited lysosomal storage disorder that progressively destroys nerve cells (neurons) in the brain and spinal cord. The condition may be classified into three major types based on the general age that signs and symptoms first appear: classic infantile (type 1); juvenile (type 2); and adult ons...
Is dextrocardia with situs inversus inherited? In most cases of dextrocardia with situs inversus, a specific genetic cause has not been identified and inheritance patterns have not been confirmed. However, approximately 25% of affected people have primary ciliary dyskinesia, which is typically inherited in an autosomal...
Cohen syndrome is an inherited disorder that affects many parts of the body and is characterized by developmental delay, intellectual disability, small head size (microcephaly), and weak muscle tone (hypotonia). Other features include progressive nearsightedness (myopia), degeneration of the light-sensitive tissue at t...
How might progressive hemifacial atrophy be treated?
Activated PI3K-delta syndrome is a disorder that impairs the immune system. Individuals with this condition often have low numbers of white blood cells (lymphopenia), particularly B cells and T cells. Normally, these cells recognize and attack foreign invaders, such as viruses and bacteria, to prevent infection. Beginn...
How might pseudohypoaldosteronism type 2 be treated? Pseudohypoaldosteronism may be treated with thiazide diuretics and dietary restriction of sodium.
How are syringomas treated? People with syringomas have a variety of treatment options, for example pulsed ablative laser (CO2 or erbium) or light electrocoagulation using a fine epilating needle. To learn more about these and other syringoma treatment options we recommend speaking with your healthcare provider.
These resources address the diagnosis or management of REN-related kidney disease: - Gene Review: Gene Review: Autosomal Dominant Tubulointerstitial Kidney Disease, REN-Related (ADTKD-REN) - Genetic Testing Registry: Hyperuricemic nephropathy, familial juvenile, 2 - MedlinePlus Encyclopedia: Hyperkalemia - MedlineP...
Summary : Playing sports can be fun, but it can also be dangerous if you are not careful. You can help prevent injuries by - Getting a physical to make sure you are healthy before you start playing your sport - Wearing the right shoes, gear, and equipment - Drinking lots of water - Warming up and stret...
Yes. Some complications from Paget's disease respond well to surgery. Joint replacement may be helpful in people with severe arthritis of the hip or knee. Surgery can also realign affected leg bones to reduce pain or help broken bones heal in a better position.
Many older people are victims of elder abuse. It is the mistreatment of an older person, usually by a caregiver. It can happen within the family. It can also happen in assisted living facilities or nursing homes. The mistreatment may be - Physical, sexual, or emotional abuse - Neglect or abandonment - Fi...
This disorder is thought to affect approximately 1 in 35,000 to 50,000 newborns.
Muscle cramps are sudden, involuntary contractions or spasms in one or more of your muscles. They often occur after exercise or at night, lasting a few seconds to several minutes. It is a very common muscle problem. Muscle cramps can be caused by nerves that malfunction. Sometimes this malfunction is due to a healt...
What causes fumarase deficiency? Mutations in the FH gene cause fumarase deficiency. The FH gene provides instructions for making an enzyme called fumarase, which participates in a series of reactions allowing cells to use oxygen and generate energy. Mutations in the FH gene disrupt the enzyme's ability to do its job. ...
The greatest potential danger posed by AVMs is hemorrhage. Most episodes of bleeding remain undetected at the time they occur because they are not severe enough to cause significant neurological damage. But massive, even fatal, bleeding episodes do occur. Whenever an AVM is detected, the individual should be carefully ...
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.
Phacomatosis pigmentovascularis (PPV) is a skin and blood vessel disorder that is present from birth. Common signs and symptoms include port wine stain and pigmentary lesions, such as melanocytic nevi or epidermal nevi. A variety of classification systems have been proposed for PPV, largely depending on what type of pi...
Summary : Statins are drugs used to lower cholesterol. Your body needs some cholesterol to work properly. But if you have too much in your blood, it can stick to the walls of your arteries and narrow or even block them. If diet and exercise don't reduce your cholesterol levels, you may need to take medicine. Often, ...
Dengue is an infection caused by a virus. You can get it if an infected mosquito bites you. Dengue does not spread from person to person. It is common in warm, wet areas of the world. Outbreaks occur in the rainy season. Dengue is rare in the United States. Symptoms include a high fever, headaches, joint and muscle...
Congenital dyserythropoietic anemia type 2 (CDA II) is an inherited blood disorder characterized by mild to severe anemia. It is usually diagnosed in adolescence or early adulthood. Many affected individuals have yellowing of the skin and eyes (jaundice) and an enlarged liver and spleen (hepatosplenomegaly) and gallsto...
What causes craniopharyngioma? Craniopharyngiomas are thought to arise from epithelial remnants of the craniopharyngeal duct or Rathke's pouch (adamantinomatous type tumours) or from metaplasia of squamous epithelial cell rests that are remnants of the part of the stomadeum that contributed to the buccal mucosa (squamo...
How is pityriasis lichenoides et varioliformis acuta diagnosed? A diagnosis of pityriasis lichenoides et varioliformis acuta is often suspected based on characteristic signs and symptoms. A skin biopsy can be used to confirm the diagnosis. Additional laboratory testing may be ordered to investigate a possible cause suc...
Biliary atresia is rare and only affects about one out of every 18,000 infants.1 The disease is more common in females, premature babies, and children of Asian or African American heritage.
Is branchiootorenal syndrome inherited? Branchiootorenal syndrome may be inherited or occur sporadically. The inheritance pattern of branchiootorenal syndrome is autosomal dominant. Autosomal dominant inheritance is when one mutated copy of the gene that causes a disorder in each cell is needed for a person to be affec...
Androgenetic alopecia is a common form of hair loss in both men and women. In men, this condition is also known as male-pattern baldness. Hair is lost in a well-defined pattern, beginning above both temples. Over time, the hairline recedes to form a characteristic "M" shape. Hair also thins at the crown (near the top o...
NFJS/DPR is a rare condition; its prevalence is unknown. Only a few affected families have been reported in the medical literature.
What causes nonspherocytic hemolytic anemia due to hexokinase deficiency? Nonspherocytic hemolytic anemia due to hexokinase deficiency has been shown to be caused by mutations in the HK1 gene, which cause at least a partial deficiency of the enzyme hexokinase. This enzyme plays an important role in the chemical process...
The National Institute of Neurological Disorders and Stroke (NINDS) conducts and supports research related to hemifacial spams through grants to major research institutions across the country. Much of this research focuses on better ways to prevent, treat, and ultimately cure neurological disorders, such as hemifacial ...
These resources address the diagnosis or management of gastrointestinal stromal tumor: - American Cancer Society: Treating Gastrointestinal Stromal Tumor (GIST) - Cancer.Net: Gastrointestinal Stromal Tumor--Diagnosis - Genetic Testing Registry: Gastrointestinal stromal tumor These resources from MedlinePlus offer ...
How might fibrolamellar carcinoma be treated? The standard treatment for fibrolamellar carcinoma (FLC) is surgical resection. Due to the rarity of the condition, there is limited information to support the use of other treatment options and there is no standard chemotherapy regimen. However, other treatments may be con...
Aminoacylase 1 deficiency is caused by mutations in the ACY1 gene. This gene provides instructions for making an enzyme called aminoacylase 1, which is involved in the breakdown of proteins when they are no longer needed. Many proteins in the body have an acetyl group attached to one end. This modification, called N-ac...
Anencephaly is a condition that prevents the normal development of the brain and the bones of the skull. This condition results when a structure called the neural tube fails to close during the first few weeks of embryonic development. The neural tube is a layer of cells that ultimately develops into the brain and spin...
How might relapsing polychondritis be treated? The primary goals of treatment for people with relapsing polychondritis (RP) are to relieve present symptoms and to preserve the structure of the affected cartilage. The main treatment for RP is corticosteroid therapy with prednisone to decrease the severity, frequency and...
Symptoms Can Be Controlled With proper treatment, most people with gout are able to control their symptoms and live productive lives. The goals for treatment are to ease the pain that comes from sudden attacks, prevent future attacks, stop uric acid buildup in the tissues and joint space between two bones, and prevent ...
Dry mouth is the condition of not having enough saliva, or spit, to keep your mouth wet. Everyone has dry mouth once in a while -- if they are nervous, upset, or under stress. But if you have dry mouth all or most of the time, it can be uncomfortable and lead to serious health problems. Though many older adults have dr...
Most cases of preeclampsia do not seem to be inherited. The tendency to develop preeclampsia does seem to run in some families; however, the inheritance pattern is unknown.
Pallister-Killian mosaic syndrome appears to be a rare condition, although its exact prevalence is unknown. This disorder may be underdiagnosed because it can be difficult to detect in people with mild signs and symptoms. As a result, most diagnoses are made in children with more severe features of the disorder. More t...
Myocarditis is a condition that is characterized by inflammation of the heart muscle (myocardium). Some affected people have no noticeable symptoms of the condition. When present, signs and symptoms may include chest pain, abnormal heartbeat, shortness of breath, fatigue, signs of infection (i.e. fever, headache, sore ...
Otopalatodigital syndrome type 1 is a disorder primarily involving abnormalities in skeletal development. It is a member of a group of related conditions called otopalatodigital spectrum disorders, which also includes otopalatodigital syndrome type 2, frontometaphyseal dysplasia, and Melnick-Needles syndrome. In genera...
Klver-Bucy syndrome is a rare behavioral impairment that is associated with damage to both of the anterior temporal lobes of the brain. It causes individuals to put objects in their mouths and engage in inappropriate sexual behavior. Other symptoms may include visual agnosia (inability to visually recognize objects), l...
2q37 deletion syndrome is caused by a deletion of genetic material from a specific region in the long (q) arm of chromosome 2. The deletion occurs near the end of the chromosome at a location designated 2q37. The size of the deletion varies among affected individuals. The signs and symptoms of this disorder are probabl...
Is genetic testing available for Coats disease? Genetic testing is not available for most cases of Coats disease. Eighty to 90% of affected people have no evidence of a genetic predisposition to the condition and no affected family members. Rarely, Coats disease can be inherited as a feature of several different geneti...
Wildervanck syndrome is a condition that occurs almost exclusively in females and affects the bones in the neck, the eyes, and the ears. It is characterized by Klippel-Feil anomaly (in which the bones of the neck fuse together), Duane syndrome (an eye movement disorder that is present from birth), and hearing loss. ...
Potassium aggravated myotonia is a group of diseases that causes tensing and stiffness (myotonia) of skeletal muscles, which are the muscles used for movement. The three types of potassium-aggravated myotonia include myotonia fluctuans, myotonia permanens, and acetazolamide-sensitive myotonia. Potassium aggravated my...
These resources address the diagnosis or management of dermatofibrosarcoma protuberans: - American Cancer Society: How are Soft Tissue Sarcomas Diagnosed? - American Cancer Society: Treatment of Soft Tissue Sarcomas - Genetic Testing Registry: Dermatofibrosarcoma protuberans - National Cancer Institute: Adult Soft ...
These resources address the diagnosis or management of autosomal recessive axonal neuropathy with neuromyotonia: - Genetic Testing Registry: Gamstorp-Wohlfart syndrome These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests - Drug Thera...
Dysgraphia is a neurological disorder characterized by writing disabilities. Specifically, the disorder causes a person's writing to be distorted or incorrect. In children, the disorder generally emerges when they are first introduced to writing. They make inappropriately sized and spaced letters, or write wrong or mis...
What are the signs and symptoms of Myelofibrosis? The Human Phenotype Ontology provides the following list of signs and symptoms for Myelofibrosis. 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 to loo...
What are the signs and symptoms of Pontocerebellar hypoplasia type 5? The Human Phenotype Ontology provides the following list of signs and symptoms for Pontocerebellar hypoplasia type 5. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use t...
Researchers are working to develop drugs called "molecularly targeted agents" which kill cancer cells by targeting key molecules involved in cancer cell growth.
Schinzel-Giedion syndrome is very rare, although the exact prevalence is unknown.
- Gas is air in the digestive tract. - Everyone has gas. Burping and passing gas are normal. - Gas in the digestive tract is usually caused by swallowing air and the breakdown of certain foods in the large intestine. - Most foods that contain carbohydrates can cause gas. - Foods that cause gas for one person may no...
What are the signs and symptoms of human T-cell leukemia virus, type 1? Human T-cell leukemia virus, type 1 (HTLV-1) generally causes no signs or symptoms. However, some affected people may later develop adult T-cell leukemia (ATL), HTLV-1 associated myelopathy/tropical spastic paraparesis (HAM/TSP) or other medical co...
Lamellar ichthyosis is a rare genetic condition that affects the skin. Infants affected by lamellar ichthyosis are generally born with a shiny, waxy layer of skin (called a collodian membrane) that is typically shed within the first two weeks of life. The skin beneath the collodian membrane is red and scaly. Other sign...