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High-grade PIN : Cribriform type

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Cribriform high-grade PIN consists of large glandular units with punched out lumina. The acinar cells form Roman bridges that criss-cross the lumen. The nuclei show enlargement and hyperchromasia with prominent nucleoli. With basal cell markers, a fragmented basal cell layer is usually seen. The differential diagnosis includes cribriform carcinoma, ductal carcinoma, and basal cell hyperplasia with prominent nucleoli.

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