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INTRODUCTION Hemophilic pseudotumor is a rare complication that occurs in patients with severe hemophilia. Results from multiple episodes of bleeding into the bones and soft tissues. PRESENTATION OF CASE A 31 years old male patient, with severe hemophilia A. Diagnosed with an abdominal tumor 10 years ago during routine screening, that progressively grew to encompass the entire abdominal area, with symptoms of intestinal obstruction. DISCUSSION Hemophilic pseudotumor appears as a painless tumor of slow growth that can compress vital organs producing bone destruction, muscle and skin necrosis. The tumor may have fistulas or break spontaneously. CONCLUSION The abdominal hemophilic pseudotumor is a rare pathological entity, with few reports worldwide, but must be considered in hemophilic patients with a well documented abdominal tumor. [ABSTRACT FROM AUTHOR]

Hemophilic pseudotumor is a rare and serious complication of hemophilia, often occurring in the long bones and muscle tissue of the extremities, with an incidence of about 1–2%. However, there is no effective surgical treatment for massive hemophilia pseudotumors of the extremities. Therefore, we would like to report this case to provide new ideas and methods for the treatment of massive hemophilic pseudotumors of the extremities through resection and total femoral prosthesis reconstruction. After admission, the patient first underwent a month-long coagulation factor replacement therapy to maintain the patient's factor IX level at approximately 100%. Then, extensive resection of hemophilic pseudotumor and total femoral prosthesis reconstruction was performed in collaboration with several departments, and we collected the patient's preoperative, intraoperative and postoperative data for analysis. After coagulation factor replacement therapy the patient's factor IX level was significantly increased and approached 100%. The surgical procedure was uneventful, and postoperative X-ray suggested a well-positioned prosthesis with postoperative pathological features consistent with a hemophilic pseudotumor. The patient was able to move around with the assistance of a walker 14 days after surgery, and there was no recurrence after one year of follow-up. For treat the massive hemophilic pseudotumors of the extremities, extensive resection and prosthetic replacement with coagulation factor replacement therapy is a safe and effective treatment that can significantly improve the prognosis and quality of life of patients. • This is the first report of such a large hemophilic pseudotumor of the proximal extremities with severe pathological fractures. • This is the first report of the application of extensive resection and total femoral prosthetic reconstruction for the treatment of hemophilic pseudotumors of the extremities. • Good prognosis achieved by standardized coagulation factor replacement therapy in combination with surgical treatment. • We hope that this case report can provide new ideas for the treatment of hemophilia pseudotumors of the extremities and functional reconstructive surgery of the extremities. [ABSTRACT FROM AUTHOR]