R0 Complete resection, margins histologically negative, no residual tumor left after resection (primary tumor, regional nodes)
Logical Observation Identifier Names and Codes
0‑L
LA26543-1
R1 Incomplete resection, margins histologically involved, microscopic tumor remains after resection of gross disease (primary tumor, regional nodes
Logical Observation Identifier Names and Codes
0‑L
LA26544-9
R2 Incomplete resection, margins macroscopically involved or gross disease remains after subtotal resection (eg primary tumor, regional nodes, or liver metastasis)
Logical Observation Identifier Names and Codes
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