Atypical sonographic presentation of fetal unilateral inguinoscrotal hernia in a multiple gestation.

Ultrasonographic demonstration of bowel peristalsis within the fetal scrotum has been described as a pathognomonic sign of inguinoscrotal bowel herniation. We present the sonographic features and neonatal outcome of a fetus with a scrotal mass seen at 34 weeks of gestation in a twin pregnancy. This mass was diagnosed postnatally as a non-reducible inguinoscrotal hernia, in which bowel peristalsis had not been observed by real-time ultrasound in utero.