Congenital subcostal hernia with unusual contents.

Congenital hernias arising in the subcostal region are rare. We describe a case of a former preterm infant, born with congenitally fused right 11th and 12th ribs and a protuberant mass in the right subcostal region. This mass was associated with a small fascial defect and herniation of abdominal contents. At operation, the mass was determined to be a hernia with an incarcerated ovarian remnant and fallopian tube.