Giant cell tumor of soft tissues: A case report of extra-articular diffuse-type giant cell tumor of the quadriceps.

Introduction: Giant cell tumors of soft tissue (GCTs) are a relatively rare entity. It is a distinct but uncommon group of neoplasms morphologically identical to osseous giant cell tumor. The diffuse type of extra-articular GCT arising within muscle is a rare benign soft tissue tumor with a wide spectrum of clinical presentation.