Fig. 15.

Low-grade fibromatosis-like spindle cell carcinoma. (A) Low-magnification showing a fibrous tumor with finger-like infiltrative margins; (B) bland-looking spindle cells are set in a fibrous stroma and exhibit a fascicular arrangement; (C) some tumor areas show single or small groups of round to epithelioid cells scattered throughout the fibrous stroma; (D) these neoplastic cells show nuclear expression of p63.