Parapagus conjoined twins are a rare form of twinning that is not commonly seen in literature. Conjoined twins are caused by a late division of a single egg or random fusion of two eggs. This late division occurs 13 days after fertilization. There are different types of conjoined twins that are named by their point of attachment. Parapagus twins are a type of conjoined twins joined together by part of the chest down to the pelvis. They have their own set of limbs and heads, but share a heart. Because of the point of attachment, they have a poor prognosis. Ultrasound is the modality of choice to assess pregnancies and form a diagnosis of various abnormalities. This case study will show the use of ultrasound in diagnosing conjoined twins, differential diagnoses, and overall more information about their etiology and treatment of the diagnosis.
