Immature mesenteric teratoma in a male newborn infant: prenatal ultrasonographic diagnosis and surgical treatment.

A very rare case of mesenteric teratoma, detected by routine ultrasound screening at 20 weeks' gestation, is reported. The patient, a male newborn delivered at 40 weeks' gestation in good condition, was successfully operated on at birth. The post-operative course was regular and the baby is currently doing well.