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The results of needle aspiration cytology of solid renal lesions in Brighton from 1977 have been reviewed. Thirty-one lesions were aspirated and of the 21 malignant tumours, cytology accurately diagnosed 19 (90%) when sufficient material was sent for analysis. Of the eight avascular solid renal space-occupying lesions aspirated, cytology gave a correct differentiation (benign versus malignant) in seven (87%). The results compare favourably with those of other published experience. A modification is suggested to the accepted diagnostic pathway.

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