A benign neoplasm that can arise from any of the adrenal cortical layers. It can be associated with the overproduction of glucocorticoids (Cushing's syndrome), androgenic or estrogenic steroids (adrenogenital syndrome), or mineralocorticoids (Conn's syndrome). (Sternberg Diagnostic Surgical Pathology, 3rd ed.). The disease is Monarch Disease Ontology term MONDO_0003924 (adrenal cortex adenoma). Also known as: adenoma of adrenal cortex, adenoma of adrenal gland, adenoma of the adrenal cortex, adenoma of the adrenal gland, adenoma, adrenocortical, benign, adrenal adenoma, adrenal cortical adenoma, adrenal gland adenoma.