Cystoscopic Forceps Biopsies and Transurethral Resection Specimens in the Classification of Bladder Tumours

Abstract

The findings from primary cystoscopic biopsy were compared with those from resected (TUR B) tissue in 50 consecutive cases of newly diagnosed bladder tumour. There was a clear tendency to underestimate the cytologic grade of malignancy in forceps biopsies, particularly in the more highly differentiated tumours. The diagnosis of transitional cell tumour grade I from a forceps biopsy is uncertain. Demonstration of invasive growth was more frequent in the TUR B specimens than in the primary diagnostic biopsies.