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SEER Inquiry System - Report
Produced: 11/22/2025 9:01 AM
Question 20150007
Inquiry Details
References:
#1: 2007 MP/H Rules
#2: ICD-O-3
Question:
MP/H Rules/Histology: What is the proper histology code -- mucin producing adenocarcinoma or cholangiocarcinoma for the following case? See discussion.
Discussion:
4/10/13 Partial hepatectomy: well differentiated mucin producing adenoca involve right and left hepatic ducts, common hepatic duct & common bile duct. Invasion beyond wall of bile duct. CT Scan after 1st surgery shows residual neoplasm cannot be excluded
7/31/13 Left lateral segmentectomy: residual well differentiated cholangiiocarcinoma involving connective tissue surrounding major bile ducts. Per medical director, histolgically code to cholangiocarcinoma.
Primary site: Extra hepatic bile duct. Chemo (5FU, Leucovorin, Oxaliplatin) was started 5/1.
Answer:
Code the histology as well differentiated mucin producing adenoca based on the 4/10/13 pathology report.
Code histology from the pathology report of the procedure which removed the most tumor tissue -- this is from the MP/H general instructions for coding histology. We are assuming that the partial hepatectomy removed the most tumor tissue in this case.
Per WHO, mucin producing adenoca is a variant of cholangiocarcioma.
