Myxoinflammatory Fibroblastic Sarcoma

Abstract

MIFS is a low-grade fibroblastic sarcoma that predilects to superficial distal extremity soft tissue. It is composed of plump spindled and epithelioid cells, inflammatory infiltrates, and mucin deposits in a fibrosclerotic stroma. Large epithelioid cells harboring bizarre nuclei and virocyte-like macronucleoli and pleomorphic pseudolipoblasts are characteristic. While conventional MIFS has locally recurrent potential but minimal metastatic risk, tumors with high-grade histologic features have a greater risk for recurrence and metastasis. Wide local excision is the recommended treatment.

Keywords: Emperipolesis; Myxoinflammatory fibroblastic sarcoma; Pseudolipoblasts; Reed-Sternberg-like cells; Virocyte-like cells.