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Eble JN, Sauter G., Epstein JI, Sesterhenn IA - iarc

Eble JN, Sauter G., Epstein JI, Sesterhenn IA - iarc

Eble JN, Sauter G., Epstein JI, Sesterhenn IA - iarc

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A<br />

B<br />

Fig. 3.63 A Micropapillary high grade PIN. Note more benign appearing cytology towards center of gland. B Cribriform high grade PIN. Note more benign appearing<br />

cytology towards center of gland.<br />

normally rimming ducts and acini is intact<br />

in low grade PIN. It is difficult to reproducibly<br />

distinguish low grade PIN from<br />

normal and hyperplastic epithelium {709}.<br />

High grade PIN is characterized by a<br />

more uniform morphologic alteration.<br />

Cytologically, the acini and ducts are<br />

lined by malignant cells with a variety of<br />

architectural complexity and patterns.<br />

The individual cells are almost uniformly<br />

enlarged with increased nuclear/cytoplasmic<br />

ratio, therefore showing less<br />

variation in nuclear size than that seen in<br />

low grade PIN. Many cells of HGPIN contain<br />

prominent nucleoli and most show<br />

coarse clumping of the chromatin that is<br />

often present along the nuclear membrane.<br />

HGPIN can be readily appreciated<br />

at low power microscopic examination<br />

by virtue of the darker "blue" staining<br />

of the lining that reflects the expanded<br />

nuclear chromatin area {294}.<br />

Architectural patterns of HGPIN<br />

Four patterns of HGPIN have been<br />

described, which are flat, tufting,<br />

micropapillary, and cribrifrom: nuclear<br />

atypia without significant architectural<br />

changes (flat pattern); nuclei become<br />

more piled up, resulting in undulating<br />

mounds of cells (tufting pattern);<br />

columns of atypical epithelium that typically<br />

lack fibrovascular cores (micropapillary<br />

pattern); more complex architectural<br />

patterns appear such as Roman<br />

bridge and cribriform formation (cribriform<br />

pattern). The distinction between<br />

cribriform high grade PIN and ductal carcinoma<br />

in-situ is controversial (see duct<br />

carcinoma in-situ) {288}. In high grade<br />

PIN, nuclei towards the centre of the<br />

gland tend to have blander cytology, as<br />

compared to peripherally located nuclei.<br />

The grade of PIN is assigned based on<br />

assessment of the nuclei located up<br />

against the basement membrane.<br />

Histologic variants<br />

Signet-ring variant. High grade prostatic<br />

intraepithelial neoplasia (PIN) with<br />

signet-ring cells is exceedingly rare with<br />

only three reported cases {2181}. In all<br />

cases signet-ring cell PIN was admixed<br />

with adjacent, invasive signet-ring carcinoma.<br />

Histologically, cytoplasmic vacuoles<br />

displace and indent PIN cell nuclei.<br />

The vacuoles are mucin-negative by histochemical<br />

staining (mucicarmine,<br />

Alcian blue, PAS).<br />

A<br />

Fig. 3.64 A High-grade prostatic intraepithelial neoplasia, signet ring type. Intraluminal signet ring neoplastic cells confined to a pre-existing gland, as demonstrated<br />

by positive basal cell staining (34BE12 immunostain). B High-grade prostatic intraepithelial neoplasia, of mucinous type, with a flat pattern of growth. Note intraluminal<br />

filling of the gland by blue mucin.<br />

B<br />

Prostatic intraepithelial neoplasia<br />

195

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