An Unusual Presentation of Hemophilia A: Pseudotumor of Distal End Radius-Masquerading as Giant Cell Tumor.

Hemophilia is a coagulation defect caused by a functional or absolute deficiency of coagulation factors. Deficiency of factor VIII leads to hemophilia A; deficiency of factor IX causes hemophilia B. Pseudotumor may arise from hemorrhage into the muscle and within the subperiosteal space and can lead to destruction of the adjacent muscle, bone, nerves, and vessels.