Abstract

• Cholesteatoma is a form of squamous metaplasia resulting in a collection of keratin composed of desquamated epithelial cells and occurs extremely rarely in the urinary tract.
  Cholesteatoma of the renal plvis was first described by Ebstein in 1982. Since the fewer than 30 cases have been reported until now in the literatures.
  The authors experienced a cholesteatoma of the renal pelvis in 42 years old female patient who had been suffered from intermittent right flank pain, and reported the case with review of the literatures.