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BACKGROUND: Adenomatoid tumors are rare benign neoplasms of mesothelial histogenesis. They are usually located in the genitourinary system in men and women, although exceptional cases of extragenital manifestation have been reported, for example in the adrenal gland. These tumors show multiple histological patterns, among which the angiomatoid, adenoid and cystic stand out. CLINICAL CASE: A 39-year-old male patient with an adrenal adenomatoid tumor, identified by chance, with follow-up in a chronic alcohol consumption rehabilitation program. The tumor measured 46 x 30 x 46 mm, was white and homogeneous. Histologically, mesothelial cells in an angiomatoid and adenoid pattern were observed, accompanied by lymphoid aggregates, with positivity for Cam 5.2, CK7, calretinin and podoplanin, and negativity for inhibin, synaptophysin, Melan A and CK20. CONCLUSIONS: Adenomatoid tumors are benign neoplasms of mesothelial origin, which can appear in atypical locations, such as the adrenal gland. It is important to know its characteristics and differential diagnoses because it can pose a clinical, radiological, and histological challenge. [ABSTRACT FROM AUTHOR]