Localized renal cystic disease: report of a rare case.

We report a case of a 32-year-old female who presented with right flank pain. Ultrasonography done for hematuria 10 years ago indicated the presence of renal cysts in the right kidney, but she had been asymptomatic since then. This history attracted our attention to the possibility of "localized renal cystic disease" (LRCD). Diagnosis was confirmed by computerized tomogram, negative renal ultrasound of one of the parents and absence of family history of renal disease. She is still being followed up for the last 3 years and is doing well. LRCD has been given various names since it was first recognized as a distinct clinical entity but the term LRCD appears to be the most accurate. Here, we present a brief discussion of clinical significance, diagnosis and differentials of this rare condition.