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| Micro = tumour with variable architecture (nested, trabecular or lobular), small-to-moderate cytoplasm, +/-distinct nucleoli, cell size variable (small to large); glandular and squamous differentiation are absent by definition | | Micro = tumour with variable architecture (nested, trabecular or lobular), small-to-moderate cytoplasm, +/-distinct nucleoli, cell size variable (small to large); glandular and squamous differentiation are absent by definition | ||
| Subtypes = | | Subtypes = | ||
| LMDDx = poorly differentiated [[squamous cell carcinoma of the head and neck]], [[small cell carcinoma]], SMARCB1-deficient sinonasal carcinoma, others | | LMDDx = poorly differentiated [[squamous cell carcinoma of the head and neck]], [[small cell carcinoma]], [[SMARCB1-deficient sinonasal carcinoma]], others | ||
| Stains = | | Stains = | ||
| IHC = pankeratin +ve, [[EMA]] +ve, [[CK7]] +ve, [[CK5/6]] -ve, NSE +ve/-ve, chromogranin A -ve, synaptophysin -ve, [[p63]] +ve/-ve | | IHC = pankeratin +ve, [[EMA]] +ve, [[CK7]] +ve, [[CK5/6]] -ve, NSE +ve/-ve, chromogranin A -ve, synaptophysin -ve, [[p63]] +ve/-ve |
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