Modification of The Paris System for urinary tract washing specimens using diagnostic cytological features

The Paris System (TPS), which was recently introduced, emphasised the key features of malignant urine cytology: a high nuclear to cytoplasmic ratio, nuclear hyperchromasia, irregular nuclear membranes and coarse chromatin. Although other diagnostic features have been described, the diagnostic significance of such features and their application to TPS have not been fully defined for urinary tract washing specimens.

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