- A benign neoplasm of adipose tissue, composed of mature fat cells. SYN: adipose tumor. [lipo- + G. -oma, tumor]- l. annulare colli an encircling growth of l. (or coalescent lipomas) in the neck, resulting in a collar-like enlargement. SEE ALSO: Madelung neck.- l. arborescens an irregularly shaped l. involving the synovial membrane of a joint, resulting in fingerlike or treelike hyperplastic folds in the villi.- atypical l. l., occurring primarily in older men on the posterior neck, shoulders, and back, which is benign but microscopically atypical, containing giant cells with multiple overlapping nuclei forming a circle. SYN: pleomorphic l..- l. capsulare a well-circumscribed mass resulting from a greatly increased amount of adipose tissue adjacent to the breast.- l. cavernosum SYN: angiolipoma.- l. fibrosum SYN: fibrolipoma.- l. myxomatodes SYN: myxolipoma.- l. petrificans a l. in which degeneration and necrosis results in a considerable amount of dystrophic calcification.- spindle cell l. a microscopically distinctive benign form of l. in which adipose tissue is infiltrated by fibroblasts and collagen; usually found in the shoulder or neck of elderly men.
* * *li·po·ma·tous -mət-əs adj
* * *n. (pl. lipomas or lipomata)a common benign tumour composed of well-differentiated fat cells.
* * *lip·o·ma (lip-oґmə) [lip- + -oma] a benign, soft, rubbery, encapsulated tumor of adipose tissue, usually composed of mature fat cells; it generally occurs as a solitary lesion in the subcutaneous tissue of the trunk, nucha, or forearms but may occur in deeper soft tissues. lipomatous adj
Medical dictionary. 2011.