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SEER Inquiry System - Report
Produced: 04/21/2026 8:18 PM
Question 20031120
Inquiry Details
References:
ICD-O-3, 57, 69
Question:
Primary site: How is this field coded for a malignant spindle cell neoplasm in a subcutaneous mass of the right knee? See Description.
Discussion:
The pathology report says: Right knee tumor:
A. discrete subcutaneous mass 3.5x5.2x1.4 cm malignant spindle cell neoplasm (see Comment)
B. A focus of subcutaneous malignant neoplasm is identified in the superior resection margin.
C.All other margins are clear.
The comment mentions that the specimen has been sent to Mayo Clinic and the Mayo clinic consult says, "we still believe that the diagnosis of spindle cell carcinoma is correct. Obviously the differential diagnosis involves melanoma and sarcoma also. The results of the immunoperoxidase stains strongly support the prior diagnosis of a carcinoma."
Answer:
Code the site to C49.2 [Connective, subcutaneous and other soft tissues of lower limb and hip]. The site is a subcutaneous mass. C49 with 8032/3 will not be impossible following the next updates to the SEER edits.
