Margin status
The pathological assessment of surgical resection margins to determine completeness of tumor removal and predict recurrence risk.
Full Definition
Margin status refers to the pathological evaluation of surgical resection boundaries to assess whether malignant tissue extends to the edges of the specimen. Classification includes R0 (microscopically negative margins), R1 (microscopically positive margins), and R2 (macroscopically positive margins). In pancreatic surgery, specific attention is paid to the pancreatic neck margin, common bile duct margin, and circumferential margins including the superior mesenteric artery and portal vein grooves. Positive margins significantly impact prognosis and may influence adjuvant treatment decisions. The definition of adequate margin distance varies by tumor type and location, with ongoing debate about optimal margin requirements in pancreatic adenocarcinoma.
Usage
Usage note: Specify which margins are involved and use standardized R0/R1/R2 classification.
In Context
- "Final pathology revealed R1 margin status with involvement of the pancreatic neck margin." — Pathology report
- "Achieving R0 margin status is associated with improved overall survival in pancreatic cancer." — Surgical outcomes study