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SEER Inquiry System - Report
Produced: 10/24/2025 7:07 PM
Question 20081059
Inquiry Details
References:
WHO Class H & N Tumors, 355. 2005
Question:
Reportability/Histology--Head and Neck: Is a right cerebellopontine (CP) angle endolymphatic sac papillary tumor (ELST) reportable? If so, what is the histology code?
Discussion:
Answer:
Revised December 2015
ELST is reportable. Code histology to adenocarcinoma (8140/3). Code primary site to inner ear (C301).
Endolymphatic sac tumors are rare non-metastasizing adenocarcinomas that originate in the endolymphatic sac of the inner ear (C301). They are slow growing and widely invade, and in later stages often destroy, the petrous bone. The WHO Classification assigns ICD-O-3 code 8140/3.
History:
ELST is reportable. Code histology to papillary adenocarcinoma (8260/3). Code primary site to inner ear (C301).
Endolymphatic sac tumors are rare low grade malignancies that originate in the endolymphatic sac of the inner ear (C301). ICD-O-3 does not provide a specific histology code for this entity. Our pathologist consultant suggested coding these to papillary adenocarcinoma.
