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Florid Brunn Nests

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UrinaryBladder_Histology6.jpg

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Some bladder specimens show exuberant Brunn nests which may mimic nested variant of urothelial carcinoma. This image shows small solid clusters of urothelial cells lacking cytologic atypia scattered throughout the lamina propria. However, note the linear, non-infiltrative base. The nests stop just short of muscularis propria.

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