The relationship between non-invasive papillary lesions and invasive bladder carcinoma

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Abstract
Ten patients with noninvasive papillary lesions who subsequently developed invasive bladder carcinoma were identified. Five of the 10 patients developed an invasive carcinoma in a location distinctly separate from any preceding papillary lesion. The remaining five patients developed an invasive carcinoma in the same general location as a preceding papillary lesion. These findings suggest that invasive bladder carcinomas, which develop in a patient with previous noninvasive papillary lesions, often arise from nonpapillary urothelium adjacent the noninvasive papillary lesion rather than directly from the preceding papillary lesion.