“…Because they can develop slowly and painlessly deep in soft tissue, pseudotumours of the pelvis may be very large when first detected and generally do not respond to conservative management [2]. Four cases of large pelvic pseudotumours have been published within the past 10 years [2][3][4][5], but only one involved a patient with severe haemophilia [5] haemophilia severity was not stated in one case [3]. Destruction of the ilium was noted in all four cases, but none was managed using compound osteosynthesis [2][3][4][5].…”