A Case of Hemophilia B with Abdominal and Pelvic Pseudotumor

Hemophilia B is a genetic disorder caused by coagulation factor Ⅸ(FⅨ) deficiency, mainly manifesting as joint, muscle and deep tissue bleeding. Hemophilia pseudotumor is a mass formed by soft tissue liquefaction and necrosis caused by repeated bleeding. Most pseudotumors occur in the bone and muscle. We report a case of hemophilia B with pseudotumor formation in the pelvis and abdomen, where lesion location is relatively rare. After active and effective hemostasis, the patient's hematuria symptom gradually improved. This case suggests that early and timely hemostatic treatment is crucial for patients with hemophilia.