TUMOR-LIKE MANIFESTATIONS OF RENAL OSTEOP ATHY - DIFFERENTIAL-DIAGNOSIS AND TYPICAL OBSERVATIONS

The course of renal osteodystrophy possibly includes changes, which ca n mistakenly considered malignant. Especially dialysis-associated tumo ral calcinosis may mislead to an inadequate aggressiv surgical procedu re. Spontanous involution of these lesions takes place after subtotal parathyreoidektomy. Brown tumors subsequent secondary hyperparathyreoi dism are extremely rare. During maintenance hemodialysis frequently ap pearing intraosseous cysts develop secondary to beta-2-microglobulin-a myloidosis. Surgery only should be performed in case of occuring patho logic fractures. Other cases are treated conservatively under continou s nephrologic supervision.