A benign tumor composed of glandular tissue organized into small cyst-like structures.
From Greek 'aden' (gland) + 'kystis' (cyst) + '-oma' (tumor). This pathological term was standardized in the late 19th century to distinguish tumors with a characteristic cystic or cavity-filled architecture from solid glandular tumors.
Adenocystomas look like miniature apartment buildings under the microscope—lots of tiny rooms (cysts) lined with glandular cells, and doctors use this architectural pattern to identify and classify the tumor.
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