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Although it is a small organ, many types of tumors can develop within it. The recently revised fifth edition of the World Health Organization (WHO) classifications (2021 World Health Organization Classification of Central Nervous System Tumors and 2022 World Health Organization Classification of Endocrine and Neuroendocrine Tumors) revealed significant changes to the classification of pituitary adenomas, the most common type of pituitary gland tumor. This change categorized pituitary adenomas as neuroendocrine tumors and proposed the name to be revised to pituitary neuroendocrine tumor (PitNET). The International Classification of Diseases for Oncology behavior code for this tumor was previously \u201c0\u201d for benign tumor. In contrast, the fifth edition WHO classification has changed this code to \u201c3\u201d for primary malignant tumors as same to neuroendocrine tumor in other organs. Because the WHO classification made an important and significant change in the fundamental concept of the disease, in this paper, we will discuss the imaging diagnosis (magnetic resonance imaging, computed tomography, and positron emission tomography) of PitNET\/pituitary adenoma in detail, considering these revisions as per the latest version of the WHO classification.<\/jats:p>","DOI":"10.1007\/s11604-023-01400-7","type":"journal-article","created":{"date-parts":[[2023,2,24]],"date-time":"2023-02-24T01:03:12Z","timestamp":1677200592000},"page":"789-806","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":80,"title":["Imaging of pituitary tumors: an update with the 5th WHO Classifications\u2014part 1. Pituitary neuroendocrine tumor (PitNET)\/pituitary adenoma"],"prefix":"10.1007","volume":"41","author":[{"given":"Taro","family":"Tsukamoto","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0621-0044","authenticated-orcid":false,"given":"Yukio","family":"Miki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,2,24]]},"reference":[{"key":"1400_CR1","unstructured":"WHO Classification of Tumours Editorial Board. Central nervous system tumours [Internet]. Lyon (France): International Agency for Research on Cancer; 2021 [cited 2022 Nov 1]. (WHO classification of tumours series, 5th ed.; vol. 6). https:\/\/tumourclassification.iarc.who.int\/chapters\/45."},{"key":"1400_CR2","unstructured":"WHO Classification of Tumours Editorial Board. Endocrine and Neuroendocrine tumours [Internet]. 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