Isolated Renal Sinus Lymphangiectasia-Close Mimic of Pelviureteric Junction Obstruction and Hydronephrosis.

Renal lymphangiectasia is a rare disorder which may present as perirenal or peripelvic collection. Isolated renal sinus lymphangiectasia is a close differential diagnosis for pelviureteric junction obstruction on ultrasound, but can be resolved without ambiguity using computed tomography and magnetic resonance imaging. Here we describe such a case where imaging helped avoid unnecessary confusion.