Abstract
Urolithiasis is a common condition, and it represents a large number of hospital visits. Under the term infundibulopelvic dysgenesis, many conditions amongst a spectrum of congenital disorders of the pelvicalyceal system are described. Retrograde intrarenal surgery (RIRS) is an effective and safe treatment modality in the management of urinary system stone disease. Fluoroscopic imaging is a cornerstone in endourology. Herein, we present a case where we diagnosed an obstructed calyx during RIRS for renal calculi and operated on it. In this extraordinary case, contrast agent was trapped in the calyx mimicking a renal stone and that was the reason that we discovered the infundibular stenosis. The patient, 24 h after the operation, left the hospital without any complications reported.