Saeed Aali - Department of Urology, Shahrekord University of Medical Sciences, Shahrekord, Iran
Fatemeh Moradi - Department of Community Nutrition, School of Nutrition and Food Science, Isfahan University of Medical Sciences, Isfahan, Iran

Renal cysts are diagnosed by ultrasonography, computerized tomography (CT), or urography. A ۳۶-year-old pregnant woman (G۲, Ab۱,within the gestational age of ۳۸ weeks) with upper abdominal pain starting from two hours ago, vomiting, and nausea was referred to theemergency department. Although abdominal examinations revealed costovertebral angle tenderness, there were no signs of peritonealirritation, and all vital signs of the patient were in a normal range. Initial investigation results including blood count (Hb: ۱۱.۴), BUN/Cr,Na/K, and UA were normal. She underwent a cesarean section (c/s) due to reduced fetal heart rate (FHR). After C/S,the CT scan showed alarge left retroperitoneal hematoma with an anterosuperior displacement of the kidney and active bleeding in the cystic lesion of the upperpole of the kidney. Pathological examinations also confirmed a simple cyst. Overall, simple renal cysts should be considered as a rare causeof spontaneous perinatal hemorrhage (SPH) in pregnancy. The diagnosis and treatment of SPH in pregnancy are also critical challenges.

Renal cyst, Pregnancy, Spontaneous perinatal hemorrhage