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. 2022 Sep 1;17(3):527–531. doi: 10.1055/s-0042-1750798

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Asian Congress of Neurological Surgeons. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. ( https://creativecommons.org/licenses/by-nc-nd/4.0/ )

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 3 — Histology of the specimen. ( A ) Histology illustrates a benign cyst with acute-on-chronic inflammation ( white asterisk ) in the vicinity of atrophic/fibrotic anterior pituitary gland tissue ( black asterisk ). ( B ) The cyst epithelium is focally ciliated ( black arrow ) and acutely inflamed by infiltrating neutrophils ( white arrow ). Underneath, there is a dense chronic inflammatory infiltrate. ( C ) Focally, the epithelium is eroded by inflammation ( black arrow ), and purulent material is seen in the cyst lumen ( white arrow ). ( D ) The epithelium shows squamous metaplasia and mild reactive atypia in places ( white asterisk ), as secondary changes to the inflammation.