flat urothelial hyperplasia

Definition: flat urothelial hyperplasia is caracterized by a thickening of the urothelium which still shows orderly maturation to the surface and lacks cytologic atypia.

Flat urothelial hyperplasia may occur de novo, where it appears to have no malignant potential.

It may also be seen in conjuction with cystitis , bladder calculi , and urothelial tumors.

Several fragments/foci should be examined to prevent overdiagnosing a single focus with tangential sectioning as flat hyperplasia.

Synopsis

 thickening of the urothelium
 orderly maturation to the surface
 lack of cytologic atypia

Images

 flat urothelial hyperplasia

• http://www.webpathology.com/image.asp?n=1&Case=57

See also

 urothelial hyperplasia

• papillary urothelial hyperplasia
• flat urothelial hyperplasia

 urothelial anomalies

• flat urothelial anomalies
• papillary urothelial anomalies