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SEER Inquiry System - Report
Produced: 11/18/2025 4:28 PM
Question 20071117
Inquiry Details
References:
#1: 2007 SEER Manual, C-926. Appendix C
#2: ICD-O-3
Question:
MP/H Rules/Histology--Brain: How many primaries are reported and what is the histology for a single brain tumor described as a low grade astrocytoma at the time of the initial partial resection and a low grade glioneuronal neoplasm at the time of the subsequent total resection? See Discussion.
Discussion:
On 4/20/07 a partial resection of a brain tumor is interpreted as low grade astrocytoma. Patient has a gross total resection on 8/13/07 with this diagnosis: low grade glioneuronal neoplasm (see comment). Comment: This case has been reviewed at ---. Dr. agrees with our interpretation (low grade glioneuronal neoplasm, possibly a dysembryoplastic neuroepithelial tumor).
Answer:
For cases diagnosed 2007 or later, this is a single primary. A single tumor is always a single primary.
Assign histology code 9400/3 [Astrocytoma, low grade]. This diagnosis was not revised or amended based on the later surgery. It is possible that the malignant component was entirely removed during the first surgery.
Cancer Site Category:
Brain and CNS
Data Item Category:
N/A
Other Category:
N/A
Year:
2007
