Evaluation of chromosomal aberrations in patients with benign conditions and reactive changes in urinary cytology.

Background: Fluorescence in situ hybridization (FISH) is routinely used to help clarify atypical urinary cytology. However, to the authors' knowledge, little is known regarding the frequency of chromosomal aberrations in non-neoplastic conditions that could potentially lead to false-positive FISH results. The objective of the current study was to evaluate the frequency of chromosomal aberrations in benign cells of the urinary tract using the UroVysion FISH test.