Non-invasive low-grade papillary urothelial carcinoma with whorled features: a report of two cases.

IF 1.1 Q4 ONCOLOGY International journal of clinical and experimental pathology Pub Date : 2025-02-15 eCollection Date: 2025-01-01 DOI:10.62347/DFQO7724
Kiran Madwani, Pramila Moideen, Michael P Toscano, Lakshmi K Vemavarapu, Trent D Trzpuc, Suash J Sharma
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Abstract

Non-invasive papillary urothelial carcinomas present as cytoarchitectural disorders without invasion through the basement membrane. They are divided into low-grade and high-grade categories on the basis of the extent of cytologic atypia and architectural disarray. Notably, divergent differentiation (such as squamous and glandular differentiation) and variants (such as nested, micropapillary, plasmacytoid, and sarcomatoid) are reported primarily in invasive and high-grade urothelial carcinomas. We present two cases of low-grade non-invasive papillary urothelial carcinoma with recently described whorled features (urothelial eddies). Both patients were 77-year-old males with small papillary lesions in the bladder. Histopathologic examination revealed low-grade non-invasive papillary urothelial carcinoma with a sporadic whorled pattern. Patient number 1's tumor exhibited cytokeratin (CK) 20 immunopositivity, up to 5% Ki-67 labeling, and wild-type p53 staining. Patient number 2's tumor was negative for CK20 with wild type p53 staining in portions with whorls, but demonstrated diffuse CK20 and extensive p53 staining (possible mutation) in tumor portions lacking whorls. Patient number 1 experienced a 14-month recurrence and a second possible recurrence 43 months after the initial diagnosis. Patient number 2 experienced recurrence of low-grade papillary urothelial carcinoma with focal whorls in one location and subsequently a distinct low-grade papillary urothelial carcinoma with whorled features in a different part of the bladder. Our limited study supports the reported association of rare whorled features with non-invasive low-grade papillary urothelial carcinoma, albeit with a diverse immunophenotype. Evaluation of both whorled and non-whorled areas in the histology along with CK20 and p53 staining may be helpful for complete diagnostic and prognostic evaluation of these cases.

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期刊介绍: The International Journal of Clinical and Experimental Pathology (IJCEP, ISSN 1936-2625) is a peer reviewed, open access online journal. It was founded in 2008 by an international group of academic pathologists and scientists who are devoted to the scientific exploration of human disease and the rapid dissemination of original data. Unlike most other open access online journals, IJCEP will keep all the traditional features of paper print that we are all familiar with, such as continuous volume and issue numbers, as well as continuous page numbers to keep our warm feelings towards an academic journal. Unlike most other open access online journals, IJCEP will keep all the traditional features of paper print that we are all familiar with, such as continuous volume and issue numbers, as well as continuous page numbers to keep our warm feelings towards an academic journal.
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Non-invasive low-grade papillary urothelial carcinoma with whorled features: a report of two cases. Ploidy status analysis in small cell lung cancer cells and its use in cytopathological diagnosis. Sequencing of high-frequency mutated genes in breast cancer (BRCA) and associated-functions analysis. Validation of machine learning application for the identification of lipid metabolism-associated diagnostic model in ischemic stroke. Association of ABCB1 gene polymorphisms with aspirin or clopidogrel resistance in ischemic stroke: a meta-analysis.
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