Non-neoplastic, tumor-like masses of histologically normal tissue in an abnormal location. In contrast to hamartoma, choristomatous tissue has normal or near normal histologic architecture.

a mass of non-neoplastic, tumor-like masses of developmental origin in which they contain tissue foreign to the anatomical location

a mass of tissue that is normal histologically, but not for the site in which it is located

a distinct cartilaginous cyst that partially or completely encircles a region typically in the lower third of the esophagus