[Pelvic chondroma].

Chondroma as a cartilage forming tumor ist localized in up to 50% of the cases in the small bones of the hands and feet, where it is considered a benign tumor. The closer the localization is towards the trunk, the more probable is potential malignancy. The problem is discussed describing two cases with chondroma of the pelvis, which developed into chondrosarcoma. As there could not be achieved any therapeutical success with radiation and chemotherapy, therapy must consist in excochleation, i.e. en-bloc-resection, special alloarthroplasty or hemipelvectomy. The more radical and the sooner the operation is performed, the higher is the chance of survival.