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Congenital tumors of the umbilical cord are rare, and teratomas of the umbilical cord are exceedingly rare. Umbilical cord masses are often detected on routine prenatal ultrasound; however, umbilical teratomas are difficult to diagnose by imaging studies alone, and often require histopathologic examination for definitive diagnosis. Given the polymorphic presentation of umbilical cord teratomas and associated congenital anomalies, amniocentesis for genetic screening and fetal karyotyping should be offered. Here we report a case of a prenatally suspected umbilical cord angiomyxoma in an otherwise normal fetus who was found to be a mature teratoma on surgical pathology.

The use of methimazole for the treatment of hyperthyroidism in the first trimester of pregnancy has been linked to several congenital malformations. Most commonly reported is choanal atresia; however, other anomalies have been described including aplasia cutis, esophageal atresia, omphalomesenteric duct remnant, and omphalocele. A definitive phenotype of methimazole embryopathy has not been described. We report a case of a newborn with prenatal methimazole exposure who was found to have an H type tracheoesophageal (TE) fistula, vitelline fistula, ruptured omphalocele, as well as multiple duplication cysts of the stomach and small intestine.