Extra-abdominal desmoid fibromatosis

Discussion:

Procedure: Excision.

Diagnosis: Histological features, consistent with extra-abdominal desmoid fibromatosis.

The immunostain antibody anti-Beta-Catenin showed intense positivity and accumulation of Beta-Catenin in the nucleus and cytoplasm.  The immunostain antibody anti-smooth muscle actin also showed diffuse intense positivity of tumor cells.  However, the immunostain antibody anti-estrogen receptor (ER) and progesteron receptor (PR) is negative.

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