Hemophilic pseudotumor in the bilateral forearms: a unique case report.

Hemophilic pseudotumor (HP) is a rarely encountered cystic mass that forms as a result of repeated bleeding from extra-articular soft tissues. HP cases have been previously documented in several locations in the body, most commonly in the femur and pelvis. To date, no upper extremity case involving the bilateral forearms has been reported. The current case involves an adult male with uncontrolled hemophilia who presented with diffuse enlargement of the bilateral forearms with associated pain. Radiographs and magnetic resonance imaging (MRI) were subsequently performed revealing variable aged hemorrhagic, expansile, lytic intramedullary lesions. In keeping with the history, a subsequent radiologic diagnosis of HP was favored, among other differentials, including benign and malignant processes with biopsy confirming the diagnosis. The hemorrhagic masses were surgically excised after initial management with factor VIII replacement. This case details a unique presentation of this pathology in the bilateral forearms and highlights the diagnostic value of radiographs and MRI in diagnosis and management.