Giant calyceal diverticulum diagnosed in pregnancy: A case report of successful percutaneous catheter management during pregnancy and robot-assisted calyceal diverticulectomy after delivery.

We report our experience with a pregnant patient with a giant calyceal diverticulum-a very rare presentation. A 30-year-old pregnant woman was referred to our department with left flank pain at 7 weeks of gestation. Ultrasonography and computed tomography showed a giant cystic lesion on the left kidney. Single-puncture drainage was performed, but when fluid immediately reaccumulated, a percutaneous catheter was placed. We suspected a fistula between the cystic lesion and renal pelvis. After delivery, we made a definitive diagnosis of a calyceal diverticulum and successfully performed robot-assisted calyceal diverticulectomy.