Parasitic conjoined twins: a case report.

Parasitic twins are a rare phenomenon and a challenge for caregivers. Occurring as a result of abnormal processes in the first several weeks of embryologic development, this condition is oftentimes diagnosed by prenatal ultrasound. This unusual condition may go undiagnosed until the time of delivery, however, despite the availability and use of advanced ultrasound techniques. The challenges presented by this condition are multiple and complex. The following case report demonstrates some of these challenges.