ArticleOxford medical case reports2026
Invasive stratified mucin-producing carcinoma of the uterine cervix masquerading as squamous cell carcinoma on biopsy: a diagnostic pitfall.
Article in Oxford medical case reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Invasive stratified mucin-producing carcinoma (ISMC) of the uterine cervix can masquerade as non-keratinizing squamous cell carcinoma (SCC) on small biopsies because it often grows as solid nests with minimal gland formation and little or no keratinization, and may show patchy cytokeratin 5/6 (CK5/6) positivity. We report a 44-year-old woman whose outside cervical biopsy was interpreted as SCC. Repeat biopsy showed SCC-like solid nests without keratinization and patchy CK5/6 positivity, but p40 and p63 were negative and periodic acid-Schiff with diastase (D-PAS) demonstrated diastase-resistant intracytoplasmic mucin within tumor nests. Radical hysterectomy revealed a human papillomavirus (HPV)-associated endocervical adenocarcinoma with a predominant ISMC component, lymphovascular invasion, and nodal metastases. This case highlights a practical diagnostic pitfall and supports a minimal, reproducible workup for p16 block-positive, SCC-like biopsies: p40/p63 plus a mucin stain (D-PAS and/or Alcian blue), with PAX8 as needed. Funding: Japan Society for the Promotion of Science (JSPS) KAKENHI [25 K10294].
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