multiple endocrine neoplasia (MEN), a hereditary hormonal disorder that occurs in an autosomal-dominant pattern. The endocrine neoplasms may be expressed as hyperplasia, adenoma, or carcinoma and may develop synchronously or metachronously. Kinds include multiple mucosal neuroma syndrome, Werner’s syndrome, Sipple’s syndrome. See also multiple endocrine neoplasia, type I, multiple endocrine neoplasia, type II.
