[Electron microscopy in the diagnosis and prognosis of transitional-cell bladder tumors].

The electron-microscopic analysis of 65 different transitional-cell tumours of the urinary bladder revealed quantitative correlations between the tumour cells belonging to different groups, types and forms of transitional-cell papilloma, transitional-cell carcinoma and undifferentiated carcinoma of the bladder. These correlations are of importance for histogenetic and differential diagnosis of these tumours. The correlation between the changes in cell composition of transitional-cell papilloma or transitional-cell carcinoma and the subsequent clinical course of the disease (prognosis) is determined.