[Rupture of renal artery aneurysm during pregnancy]

We report a case of renal artery aneurysm ruptured during pregnancy. A 32-year-old woman presented at 38th week of gestation with left flank pain. We performed a cesarean delivery for fetal distress, and found retroperitoneal hemorrhage. After delivery, she entered a pre-shock state, and abdominal computed tomography and angiography showed a left renal artery aneurysm and hemorrhage from the aneurysm. Left nephrectomy was performed, and both mother and baby were rescued. Renal artery rupture during pregnancy is a fatal event, but with quick diagnosis and adequate treatment, if possible nephron sparing surgery, most patients, including babies, can be rescued.