Source:http://linkedlifedata.com/resource/umls/id/C0334039
NCI: A reactive metaplastic change in the urinary tract epithelium. The metaplastic changes in the epithelium resemble renal tubular structures. It can occur following surgical procedures, inflammation, stone formation, or trauma.,NCI: So-called nephrogenic adenoma is a distinct metaplastic lesion of the urothelium characterized by aggregates of cuboidal or hobnail cells. These cells line thin papillary fronds on the surface or form tubular structures within the lamina propria.