During the past ten years the authors operated on 27 tumors of the pelvic region, 12 of them involving the pelvic blade, 6 the periacetabular region, further 9 the os pubis and ischii, respectively. Most of the cases (16) were chondrosarcomas. The mean age of the patients--13 male and 14 female--was 41 years. As to surgical radicality 11 wide, 10 marginal and 6 intralesional resections were performed. After a mean follow-up period of 3 years (0.5-11 years) 19 patients are alive tumor-free, 2 with tumor, 4 died and 2 were lost to follow-up. As postsurgical complication wound-healing disorder and inguinal hernia occurred in 5 cases, on the surgical field thrombosis with secondary compartment syndrome and renal insufficiency developed in one case. The authors draw the attention to the difficulties and indications of the pelvic resections (internal hemipelvectomies).