SEER Inquiry System - Question 20021202 Details

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Produced: 02/12/2026 4:19 AM

Question 20021202

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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