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1. Papillary adenoma is the most common neoplasm of the renal tubular epithelium and is a frequent incidental finding in adult kidneys. Most are õ3 mm. Lesions õ5 mm should be considered papillary adenoma. Their microscopic morphology resembles low grade papillary renal cell carcinoma to the extent that there are* Workgroup participant. no reliable cytologic criteria to distinguish individual examples from small carcinoma. That they are benign is inferred from their Presented at ‘‘Diagnosis and Prognosis of Renal high frequency compared with the frequency of progressive papil-