benign tumourlike growth made up of normal mature cells in abnormal number or distribution. While malignant tumours contain poorly differentiated cells, hamartomas consist of distinct cell types retaining normal functions. Because their growth is limited, hamartomas are not true tumours and some, such as hemangiomas that occur as birthmarks, may disappear with time. Bony tumours such as osteoid osteoma, an overgrowth of bone and immature bone tissue (osteoid), may cause pain and resorption of bone during growth. Hemangiomas (hemangioma), which are hamartomas composed of vascular tissue, may appear quite large at birth but are usually left untreated unless they threaten facial structures. Attempts at surgical removal run the risk of uncontrollable hemorrhaging and frequently leave a poorer appearance than the natural regression of the hamartoma.

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Universalium. 2010.

Look at other dictionaries:

  • Hamartoma — Classification and external resources charlz B. The hamartoma is the dark circular object on the left that dominates the image. This is a cross section, the growth being about 9 cm in diameter, while the spleen is actually about 11 cm.[1] …   Wikipedia

  • hamartoma — m. anat. patol. Malformación congénita y benigna con aspecto de un tumor que se produce por la acumulación de diversos tipos de tejidos en cualquier parte del cuerpo. Medical Dictionary. 2011. hamartoma …   Diccionario médico

  • hamartoma — {{#}}{{LM H19776}}{{〓}} {{[}}hamartoma{{]}} ‹ha·mar·to·ma› {{《}}▍ s.m.{{》}} {{♂}}En medicina,{{♀}} tumor formado por una mezcla anormal de los elementos de un tejido: • La presencia de hamartomas es detectable a través de una biopsia.{{○}}… …   Diccionario de uso del español actual con sinónimos y antónimos

  • hamartoma — Tumour like but non neoplastic overgrowth of tissue that is disordered in structure. Examples are haemangiomas (that include the vascular naevus or birthmark) and the pigmented naevus (mole) …   Dictionary of molecular biology

  • hamartoma — noun A benign mass of disorganized tissue …   Wiktionary

  • hamartoma — A focal malformation that resembles a neoplasm, grossly and even microscopically, but results from faulty development in an organ; composed of an abnormal mixture of tissue elements, or an abnormal proportion of a single element, normally present …   Medical dictionary

  • hamartoma — ham·ar·to·ma …   English syllables

  • hamartoma — n. an overgrowth of mature tissue in which the elements show disordered arrangement and proportion in comparison to normal. The overgrowth is benign but malignancy may occur in any of the constituent tissue elements …   The new mediacal dictionary

  • hamartoma — A benign (noncancerous) growth made up of an abnormal mixture of cells and tissues normally found in the area of the body where the growth occurs …   English dictionary of cancer terms

  • hamartoma — noun a focal growth that resembles a neoplasm but results from faulty development in an organ • Hypernyms: ↑growth …   Useful english dictionary

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