Restore L4 clinical chronology and add Full100 MRI schema condition

L3/extensions/README.md

@@ -0,0 +1,26 @@
+# T300 and N400 MRI extension
+
+| Cohort | Cases | Reference-stage distribution |
+|---|---:|---|
+| T300 | 300 | T1: 35; T2: 35; T3: 115; T4: 115 |
+| N400 | 400 | N0: 80; N1: 160; N2: 80; N3: 80 |
+
+Both use AJCC/UICC edition 8 and explicitly documented cM0. T300 extends the
+original T100; N400 is patient-disjoint from their combined T400 cohort. Original
+T100 includes patients with cM1 or unspecified M status, so combined T400 is not
+an all-M0 cohort. Original T100 results retain their original visual condition.
+
+The extension uses five sequences: axial T1, axial T2, axial enhanced T1,
+coronal enhanced fat-suppressed T1, and coronal precontrast non-fat-suppressed T1.
+Matched axial and coronal planes form separate ordered image groups, jointly
+supplied in each model request. A clinical display tile is 512 × 512 pixels.
+
+Target axial coverage is suprasellar cistern to inferior C3 for T staging and
+skull base to inferior sternoclavicular joint for N staging. The reviewed example
+bounds are confirmed; patient-specific boundary review is not complete across
+the extension. Image OCR screening is complete, with findings adjudication and
+visual review still open. Consequently this directory currently contains the
+cohort description only, not the 700-case image download or a final score table.
+
+See the [evaluation guide](https://github.com/pidneuralode/NPCBench/blob/main/docs/mri_extension.md)
+for the actual model-specific context, image encoding and sampling conditions.

README.md

@@ -101,9 +101,21 @@ in cohort/node construction. Native CarePath questions use supplied clinical
 context and do not recursively feed earlier model care answers back. Historical
 25-patient controls use a different decision set.
 
+## Additional MRI evaluation
+
+A separate [Full100 MRI prompt condition](supplementary/full100_schema/README.md)
+provides the original Full25 JSON output schema for all 100 patients. The MRI
+images, reference labels, pathology inputs and 217 scored care decisions are
+unchanged. This condition is evaluated separately from the paper snapshot.
+
+The [T300/N400 extension description](L3/extensions/README.md) summarizes the
+new cohorts and input format. These additional image assets are not included in
+the current download while clinical boundary review and image privacy review
+are being completed. They are not included in the released counts above.
+
 ## Ethics and use
 
-Clinical calendar dates are expressed as days from a patient-specific reference date. This preserves intervals and event order; ages, doses, findings, answers and rubric weights are retained.
+L4 retains clinical consultation, treatment and decision dates where they establish the applicable guideline edition. Birth-date expressions are removed; existing ages are retained, or an approximate age is stated with its reference year when only a birth date was available. Other longitudinal tasks use patient-relative days for converted complete dates. Answers, grouping and rubric weights are unchanged.
 
 The dataset contains authorized, de-identified benchmark derivatives under the
 hospital-defined release scope and IRB B2026-465-01. It does not contain original

supplementary/full100_schema/README.md

@@ -0,0 +1,15 @@
+# Full100 MRI prompt condition
+
+`mri_samples.jsonl` contains 100 MRI requests using AJCC/UICC edition 9.
+The 75 expanded-patient prompts now include the same JSON output example used
+for the original 25 patients. The other 25 prompts are unchanged. All patient
+IDs, images, labels and modality-source fields match the existing L6 download.
+
+Image paths are relative to `L6/full100_inputs_scored217/`, obtained by extracting
+`L6/carepath.tar.gz`. No duplicate image archive is needed. Keep the supplied
+pathology proxy-image notices and the 217-care-node scoring policy.
+
+Use `npcbench-infer --mri-prompts` with this file as described in the
+[code guide](https://github.com/pidneuralode/NPCBench/blob/main/docs/mri_extension.md).
+Care inputs must be rendered from the MRI and pathology predictions belonging
+to this condition. This file supplies inputs, not completed model results.