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. 2021 Oct 1;12:735655. doi: 10.3389/fendo.2021.735655

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Copyright © 2021 Zhu, Wang, Wang, Fan, Zhang, Li, Liu, Jiang, Deng, Duan, Yao and Zhu

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Magnetic resonance imaging showed a 1.7×1.2 cm cystic lesion with a thickened pituitary stalk and mainly peripheral enhancement (A–D). Intraoperative pictures revealed a soft yellow lesion (E) with pus-like fluid (F). Pathologic examination showed that the pituitary gland was infiltrated by foamy histocytes and lymphocytes (G, ×200). The foamy cells were immunopositive for CD68 (H, ×200) and immunonegative for CD1a (I, ×200) and S-100 protein (J, ×200).