Epidermal inclusion cyst embedded in benign fibrous histiocytic lesion with prominent epithelioid morphology

Abstract

Benign fibrous histiocytoma also known as dermatofibroma is one of the common mesenchymal neoplasms. It commonly develops in young adult with female predominance and predilection for the extremities, particularly lower extremities. Implantation of epidermis in the dermis or subcutaneous tissues may lead to the formation of epidermal inclusion cyst, which is the most common type of epithelial cyst. Development of epidermal inclusion cyst within a benign fibrous histiocytoma is a rare occurrence. This is a unique case of two unrelated lesions.

Keywords

• alk gene fusion
• benign fibrous histiocytoma
• dermatofibroma
• epidermal cyst
• epithelioid fibrous histiocytoma