Antenatal ultrasound diagnosis of isolated fetal urinary bladder exstrophy at 15 gestation weeks

Abstract: Fetal bladder exstrophy (FBE) is a rare and complex congenital malformation of the urogenital system. The features of FBE include the absence of the anterior bladder wall, eversion of the posterior bladder mucosa, exposure to the ureter and urethra, and direct fusion of the posterior bladder wall with the lower abdominal wall skin. FBE is usually detected at the fetal anomaly ultrasound assessment at 18–20 gestation weeks but can be suspected in antenatal ultrasound as early as 14–15 gestation weeks. In this report, we describe a case of isolated fetal urinary bladder exstrophy detected antenatally using two-dimensional ultrasound and color Doppler assessment at 15 gestation weeks and describe the ultrasound findings that supported the diagnosis of FBE.