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SEER Inquiry System - Report
Produced: 11/09/2026 12:26 PM
Question 20021202
Inquiry Details
References:
ICD-O-3, 50
Question:
Primary Site--Head & Neck (Middle ear): How do you code site for a skull based tumor consistent with a low grade papillary adenocarcinoma of "endolymphatic sac origin"?
Discussion:
Answer:
Code Primary Site to C30.1 [Middle ear]. The endolymphatic sac is part of the inner ear labyrinth located with in the petrous portion of the temporal bone.
Cancer Site Category:
Head & Neck
Data Item Category:
Primary site
Other Category:
N/A
Year:
2002
