Synovial hemangioma: a rare case of knee joint tumefaction in children.

Synovial hemangioma is a rare benign vascular malformation. We report a case of chronic swelling in the left knee of a 7-year-old boy. An intra-articular tumor of synovial origin could was detected after a magnetic resonance imaging scan. Surgical excision of the mass associated with partial synovectomy was carried out. A histologic examination confirmed the diagnosis of synovial hemangioma. After 36 months of follow-up, there was no sign of recurrence. We review the literature and discuss the current case, along with noting the diagnostic methods and the therapeutic aspects of this rare and benign lesion.