Prostatic Intraepithelial Neolplasia (PIN) Localization

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* 70% in peripheral zone
* 20-25% in transition zone
* 5-10% in central zone

 PIN: Pattern
* Tufting, 87%
* Micropapillary, 85%
* Cribriform, 32%
* Flat, 28%

 PIN; Variants
* Signet ring cell variant
* Mucinous variant
*Small cell neuroendocrine variant
* Foamy variant
* Inverted variant
* PIN with squamous metaplasia

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