• For omenta submitted for GI cancer cases, please see Omentum – GI.
• For omenta submitted for GYN cancer cases, please see Omentum – GYN.
• For omenta submitted for Peritoneal Mesothelioma, please see Peritoneal Mesothelioma.

Triage

1. These guidelines apply mainly to portions of peritoneum and omentum received as part of cytoreduction/HIPEC cases.
2. For GI organ specimens received with these cases, please refer to that organ’s dedicated page in the grossing manual.
3. Please be sure to review the patient’s history prior to grossing.

Gross

1. For cases that have not been previously treated and are not predominantly mucinous:
   1. If lesions are grossly evident, submit 2 blocks with representative sections.
   2. If lesions are NOT grossly evident, submit the entire specimen if it will fit in 2-3 blocks; if not, submit representative sections of the specimen in 2 blocks.
2. For mucinous tumors:
   1. If mucinous deposits are grossly identified, submit 1 section/cm of specimen, focusing on mucinous deposits, up to 10 blocks (multiple sections can be submitted in each block).
   2. If mucinous deposits are NOT grossly identified, submit the entire specimen if it will fit in 2-3 blocks; if not, submit representative sections in 2 blocks.
3. For previously treated, non-mucinous tumors:
   1. If lesions are grossly evident, submit 1 section/cm of specimen, focusing on lesional areas, up to 10 blocks (multiple sections can be submitted in each block).
   2. If lesions are NOT grossly evident, submit the entire specimen if it will fit in 2-3 blocks; if not, submit representative sections of the specimen in 2 blocks.

Added 1-29-2020 NAC