1985 Volume 76 Issue 9 Pages 1413-1418
A case of renal pelvic tumor accompanying double malformations of the urinary tract, primary obstructed megaureter and preureteral vena cava, in a 53-year-old man is reported.
Histologically the tumor was grade 2-3 transitional cell carcinoma, invading the contracted right renal parenchyma to the renal capsule. Though some part of the tumor looked like a renal cell carcinoma, histochemical examination revealed clear cell change of transitional cell carcinoma, that is, the tumor cells were negative on oil red O staining and showed only few PAS-positive granules.
This is the third case of renal pelvic tumor accompanying preureteral vena cava in Japan. No case of primary obstructed megaureter with preureteral vena cava and renl pelvic tumor has been reported.
On the basis of histological examinations, the cause of the primary obstructed megaureter is suggested to be ureteral valve formed at the junction between the right ureter and the bladder.
