[Primary chondrosarcoma of the ureter].

A 62-year-old patient had complained of recurring colicky pain in the right renal bed, seven days before he was admitted as an inpatient. Macrohaematuria was an accompanying sign during one of these attacks. Sonography revealed right urinary obstruction of medium severity; the right kidney could not be demonstrated by urography. Since CT did not yield any clue, retrograde ureteropyelography was performed. An obstructive tumour of the right ureter was identified. This tumour, which had a length of 3.5 cm and a width of 1.2 cm, was completely resected by ureteronephrectomy. Examination revealed an extraskeletal mesenchymal chondrosarcoma of predominantly intraluminal growth, and a tumour-free external ureteral wall. A chondrosarcoma at this site has not been reported as yet. Pathogenesis may be ascribed either to degeneration of an existing chorista or to the development of a pluripotent tumour parent cell.