Ectopic rest of normal tissue is known as-

Choristomas, forms of heterotopia, are closely related benign tumors, found in abnormal locations. The two can be differentiated as follows: a hamaoma is an excess of normal tissue in a normal situation (e.g. a bihmark on the skin), while a choristoma is an excess of tissue in an abnormal situation (e.g. pancreatic tissue in the duodenum).