Abstract
Villous adenoma originating in the urinary tract is uncommon. It is very rarely encountered in voided urine cytological specimens. Here, we present the case of a villous adenoma found in a voided urine cytological specimen. It was diagnosed in a pathological specimen obtained by transurethral resection of a bladder tumor. By reviewing previous voided urine cytological specimens of the patient, similar abnormal lesional cells were found and diagnosed as being suspicious for malignancy. To our knowledge, this is the first report of a villous adenoma found by voided urine cytology. We briefly discuss the differential diagnoses with urothelial carcinoma and other common entities encountered in urine cytological specimens and give a brief introduction of this entity.
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