The morphometric differences between the urothelial cells (wet-fixed Papanicolaoustained) in the voided urine of 2 patients with low grade and high grade bladder tumours were measured. The morphometrical data of this learning set resulted in a cytomorphometrical classification rule, which was applied to a test set of 21 cases with low grade and high grade bladder tumours. The results of the cytomorphometrical classification rule correspond very well with the histomorphometrical classification and the histological grade of the parent tumours. The results indicate that it is feasible to classify bladder tumours using the cytomorphometrical data of the exfoliated urothelial cells alone.
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