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SEER Inquiry System - Report
Produced: 01/28/2026 2:43 PM
Question 20031039
Inquiry Details
References:
#1: SEER EOD-88,3rd Ed, 58
#2: AJCC Cancer Staging Manual, 131-132. Sixth Edition
Question:
EOD-Clinical Extension--Liver: How do the segments of the liver described by AJCC Manual correspond to the lobes of the liver described by the SEER EOD Manual? See Description.
Discussion:
CT described hepatocellular ca involvement of the liver with nodules identified in segments 5 and 7. Would EOD-extension be coded to 30 [multiple tumors (one lobe)]?
Answer:
Segments 2, 3, and 4 correspond to the left lobe of the liver. Segments 5, 6, 7 and 8 correspond to the right lobe of the liver. Segment 1 is the caudate lobe, which has completely different drainage and vascularization, is separate from the larger right and left lobes.
For cases diagnosed 1998-2003: Since segments 5 and 7 are both in the right lobe, assign EOD-extension code 30 for the case above, unless there is mention of vascular invasion. Be sure to record the size of the largest primary tumor.
Tumor size and vascular invasion are the most important factors for AJCC 6th edition staging.
