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hamartoma
A hamartoma〔The term, from the Greek ἁμαρτία, ''hamartia'' "error", was introduced by D. P. G. Albrecht in 1904.〕 is a benign, focal malformation that resembles a neoplasm in the tissue of its origin. This is not a malignant tumor, and it grows at the same rate as the surrounding tissues. It is composed of tissue elements normally found at that site, but which are growing in a disorganized mass. They occur in many different parts of the body and are most often asymptomatic and undetected unless seen on an image taken for another reason (incidentaloma).
Choristomas, forms of heterotopia, are closely related benign tumors, found in abnormal locations. The two can be differentiated as follows: a hamartoma is an excess of normal tissue in a normal situation (e.g. a birthmark on the skin), while a choristoma is an excess of tissue in an abnormal situation (e.g. pancreatic tissue in the duodenum).
== Causes ==
Hamartomas result from an abnormal formation of normal tissue, although the underlying reasons for the abnormality are not fully understood. They grow along with, and at the same rate as, the organ from whose tissue they are made, and, unlike cancerous tumors, only rarely invade or compress surrounding structures significantly.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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