Mantosh Singh Rattan MD, Abstract Co-Author: Nothing to Disclose

Alex Towbin MD, Presenter: Nothing to Disclose

The purpose of this study is to evaluate the utility of the Bosniak classification system of cystic renal masses in pediatric patients.

A retrospective study was performed. The clinical and radiological databases at our hospital were searched to identify all pediatric patients treated with renal cystic disease between January 2000 and June 2009. In order to be included in the study, the patients needed to have non-syndromic renal cystic disease as documented by CT or MRI as well as either surgical resection of the mass or at least 2 years of stable findings on cross-sectional imaging. All CT and MR images were independently reviewed by two pediatric radiologists with no clinical information and categorized using the Bosniak classification system. The consensus Bosniak classification was then compared to the final classification based on either pathology or stability.

The initial database search yielded 57 patients with cystic renal masses. Of these 57 patients, 19 patients met the inclusion criteria (16 with surgical resection). There were 5 patients classified as having Bosniak I cystic renal masses, 6 patients classified as having Bosniak II cystic renal masses, and 2 patients with Bosniak IIF cystic renal masses. All 11 patients categorized as Bosniak I or Bosniak II had a benign lesion at resection or follow-up (10 simple cysts and 1 calyceal diverticulum). Both patients classified as IIF were found to have benign masses (chronic abscess and multilocular cystic nephroma). There were 3 patients classified as having Bosniak III cystic renal masses. Of these 3 patients all had benign lesions at resection (1 focal cystic disease, 1 renal cyst with hemorrhage, and 1 multilocular cystic nephroma). 2 patients were classified with as Bosniak IV. Each of these patients had renal cell carcinoma.

The Bosniak classification system is useful in categorizing cystic renal masses in the pediatric age group

The Bosniak classification system is useful in categorizing cystic renal masses in the pediatric age group.

Rattan, M, Towbin, A, Utility of the Bosniak Classification System for Cystic Renal Masses in Pediatric Patients.  Radiological Society of North America 2010 Scientific Assembly and Annual Meeting, November 28 - December 3, 2010 ,Chicago IL. http://archive.rsna.org/2010/9011704.html