SEER Inquiry System - Question 20220008 Details

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Produced: 01/21/2026 10:16 AM

Question 20220008

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Inquiry Details

References:

#1: 2022 SEER Manual, 6-14. Reportability

#2: WHO Class Soft Tissue & Bone, 333. 5th Edition

Question:

Reportability/Histology--Soft Tissue: Is atypical spindle cell neoplasm, primitive myxoid mesenchymal tumor of infancy (PMMTI) from the soft tissue of the leg in August of 2019, reportable?

Discussion:

Answer:

Primitive myxoid mesenchymal tumor of infancy (PMMTI) is reportable. PMMTI is listed in the new WHO 5th edition Classification of Soft Tissue and Bone Tumors under round cell sarcomas. This is a variant of BCOR sarcomas. There is a new ICD-O histology code assigned for cases diagnosed in 2022 or later (9368/3). Code this 2019 case to round cell sarcoma, undifferentiated 8803/3. Use text fields to explain the details.

Cancer Site Category:

N/A

Data Item Category:

Histology

Other Category:

Reportability

Year:

2022