Abstract: Objective To illustrate the imaging features of fetal cloacal malformations （CM） by ultrasound combined with magnetic resonance imaging （MRI）. Methods Clinical imaging characteristics of 8 fetuses suspected with CM by prenatal systematic ultrasound screening were retrospectively analyzed, and compared with the postpartum results. Prenatal imaging characteristics were summarized. Fetal and pregnant outcomes were recorded. Results Five cases who were diagnosed with CM at the third trimester were confirmed after labor or induced labor, 3 cases were misdiagnosed by prenatal ultrasound and 1 case was missed by prenatal MRI, respectively. Prenatal ultrasound characteristics mainly consisted of anal atresia （n = 5）, pelvic abdominal cyst （n = 4）, ambiguous genitalia （n = 3）, intestinal dilation （n = 2） and intestinal echo enhancement （n = 1）, respectively. Three cases were complicated with urinary hydrops. Prenatal MRI showed no high fetal signal in the rectum （n = 4）, abdominal cysts （n = 4）. Two pregnant women chose induced labor and 3 cases of live birth. Five CM fetuses were manifested with only 1 opening in the perineum, anal atresia and female appearance of external genitalia. Intraoperatively, 3 pelvic cavities converged into a common opening in the perineum in 2 cases. Conclusions Anal atresia and cystic mass in the midline of pelvic-abdominal cavity are the common prenatal imaging features of CM. The possibility of CM should be considered in the differential diagnosis in any fetus presenting with ambiguous genitalia, hydronephrosis and calcified meconium. MRI can more explicitly show the relationship among three pelvic cavities and the rectum.