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SEER Inquiry System - Report
Produced: 04/11/2026 3:01 PM
Question 20180033
Inquiry Details
References:
WHO Class Female Genital Tumors, 122, 138. 4th edition
Question:
Reportability--Corpus uteri: Is smooth muscle tumor with uncertain malignant potential (STUMP) reportable? See Discussion.
Discussion:
Spindled cell lesion of smooth muscle origin (desmin and SMA are positive, CD34, S100, pancytokeratin, Pax8, MDM2 and CDK4 are negative). Many of the cells have hyperchromatic, bizarre-shaped nuclei. Mitotic activity is inconspicuous. There are no areas of necrosis. The overall findings in this biopsy is best classified as a "STUMP"; however, a leiomyosarcoma cannot be excluded.
Answer:
STUMP (smooth muscle tumor of uncertain malignant potential) is not reportable. According to the WHO classification of uterine corpus tumors, the behavior code for STUMP is /1.
Cancer Site Category:
Corpus uteri
Data Item Category:
N/A
Other Category:
Reportability
Year:
2018
