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SEER Inquiry System - Report
Produced: 01/19/2025 9:08 AM
Question 20150046
Inquiry Details
References:
#1: Subject matter expert
#2: WHO Class Digest System Tumors, 123
Question:
Reportability--Appendix: Is the appendix the primary site for a low grade mucinous appendiceal neoplasm (LAMN) with diffuse peritoneal dissemination? See discussion.
Discussion:
Patient had an appendectomy revealing a low grade mucinous appendiceal neoplasm (LAMN) with diffuse peritoneal dissemination. Patient now with cytoreduction and hyperthermic intraperitoneal chemotherapy (HIPEC), which revealed metastatic disease in the abdomen, omentum, pelvic peritoneum, peri-cecal, and gallbladder.
Answer:
For cases diagnosed prior to 1/1/2022
Low-grade appendiceal mucinous neoplasm (LAMN) is not reportable, even when it spreads within the peritoneal cavity, according to our expert pathologist consultant. Peritoneal spread of this /1 neoplasm does not indicate malignancy. It is still /1 when there is spread of LAMN in the peritoneal cavity.
