Abstract
Inverted urothelial papilloma is a rare benign tumour and represents one of the urothelial lesions with inverted morphology. Accurate diagnosis and differentiation from other inverted lesions is important because its proper clinical management and expected clinical outcomes are distinctly different. Here we describe a case of a large inverted urothelial papilloma of the prostatic urethra and a synchronous non-invasive low-grade papillary urothelial carcinoma of the bladder in a 60-year-old man. We focus on the differential diagnosis of inverted urothelial papilloma.
Highlights
A number of well-recognized urothelial lesions with inverted morphology occur in the urinary tract
We report a case of a large inverted papilloma and a concomitant low-grade non-invasive papillary urothelial carcinoma of the urinary bladder in a 60-yearold male
The tumor was diagnosed as an inverted urothelial papilloma, trabecular type associated with cystitis glandularis, originating from the prostatic urethra
Summary
A number of well-recognized urothelial lesions with inverted morphology occur in the urinary tract. Among them inverted papilloma is a rare tumor accounting for less than 1% of all urothelial neoplasms [1,2,3,4]. Its recognition is important because of similarities to inverted urothelial carcinoma, especially in small biopsy specimens. We report a case of a large inverted papilloma and a concomitant low-grade non-invasive papillary urothelial carcinoma of the urinary bladder in a 60-yearold male
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