Extrapleural Solitary Fibrous Tumor (SFT) at Dorsum Foot - A Rare Case Report

Abstract

Solitary fibrous tumor is a benign tumor. But it has tendency for local recurrence as well as metastasis. WHO classifies it under the category of fibroblastic/myofibroblastic tumor. It most commonly occurs in pleura and very rare in extra-pleural site such as sub-cutaneous or deep soft tissue of extremity, head and neck, mediastinum, retroperitoneum, etc. Histologically SFT show patternless hypercellular and hypocellular areas of fibroblast proliferation, collagen deposition, hemangiopericytoma like areas with myxoid change or fibrosis. This tumor needs to be differentiated from other spindle cell tumors with immunohistochemistry. It is a rare entity with only a few cases reported. We report a case of 60 years old male with well circumscribed painless, swelling dorsum foot. It was clinically diagnosed as inverted papilloma, but microscopy was consistent with typical features of SFT. This was confirmed by CD 34 & CD99 positivity. This case is being presented for its rare location.