The authors made a retrospective study of 120 patients operated on for
malignant tumours of the kidneys (1970-1990). In 61 patients hematuri
a wis seen before surgery: in 21 patients it was the first and only ma
nifestation of the disease. Hematuria was most frequently observed in
transition-cell renal cancer; rarer in mixed-cell cancer. Hematuria wa
s absent in granular-cell variant of renal-cell cancer and in planocel
lular renal cancer.