Prostatic Intraepithelial Neoplasia

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Prostatic intraepithelial neoplasia and atypical glands suspicious for malignancy and mimicries of the transition zone.
WHO definition 2004
PIN is best characterized as a neoplastic transformation of the lining epithelial of prostatic ducts and acini. By definition this process is confined within the epithelium; therefore, intraepithelial.

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