Intramuscular Soft Tissue Giant Cell Tumor of the Forearm: A Case Report

We report the case of a 33-year-old female who presented with a painful, rapidly growing mass on her left dorsal forearm. Physical examination revealed a 2 cm firm, well-demarcated, non-erythematous nodule beneath the skin, with an initial diagnosis of lipoma. Upon removal, the mass was found to be intramuscular beneath the antebrachial fascia. The histopathology confirmed a benign giant cell tumor of soft tissue (GCT-ST). The patient was informed of the potential risk of recurrence, and regular follow-up was recommended. At the last follow-up, no clinical evidence of recurrence was noted. This report highlights a rare case of an intramuscular soft tissue GCT at an exceptional location, the forearm.