Haemophilic cysts (pseudotumours).

It is very likely that with the advent of widespread maintenance therapy, pseudotumours will be less common in the future. It is important that they are diagnosed early, and prevention of muscular haematomas is the key to reducing their incidence. There are a number of therapeutic alternatives for this dangerous condition: surgical removal, percutaneous management, exeresis and filling of the dead cavity, irradiation, and embolization. The management of a patient with a haemophilic pseudotumour is complex, with a high rate of potential complications. Surgical excision is the treatment of choice but should only be carried out in major haemophilia centres by a multidisciplinary surgical team. The main postoperative complications are death, infection, fistulization, and pathological fractures (even requiring amputations of affected limbs). Pelvic pseudotumours can even become complicated by fistulization to the large bowel and by obstruction of the ureters. Untreated, proximal pseudotumours will ultimately destroy soft tissues, erode bone, and may produce neurovascular complications.