SEER Inquiry System - Question 20240057 Details

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Produced: 01/16/2026 7:26 PM

Question 20240057

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Inquiry Details

References:

#1: Solid Tumor Rules. Non-Malignant CNS 2024 Update

#2: WHO Class CNS Tumors. 5th edition, online version

Question:

Solid Tumor Rules/Histology--Brain and CNS: What is the histology code for angiocentric glioma? See Discussion.

Discussion:

We would like to confirm that the correct histology code is 9431/1 per ICD-O-3.2, as the Non-Malignant CNS Solid Tumor Manual lists the histology code as both 9431/1 (pages 301 and 303 of the combined manual), but also shows it as a synonym for 9421/1 – Diffuse astrocytoma, MYB- or MYBL1 altered (page 304).

Answer:

Assign code 9431/1 for angiocentric glioma. This has been corrected in the 2025 update. Angiocentric glioma was removed from the 9421/1 row and remains in its own row.

Cancer Site Category:

Brain and CNS

Data Item Category:

Histology

Other Category:

Solid Tumor Rules (2018, 2021)

Year:

2024