Mentonian Parasitic Twin: A Rare Case Report.

Parasitic or asymmetric twins are a rare form of conjoined twins. Thoracopagus and omphalopagus are the most common types, whereas mentonian location remains exceptionally rare. We report the case of a male neonate, born to non-consanguineous parents, who presented with a parasitic twin attached to the left mentonian region, without communication with vital structures, and which was surgically excised. However, the autosite presents a complex congenital heart defect. This case illustrates an extremely rare presentation of parasitic twins located in the mentonian region and highlights the importance of a thorough multidisciplinary evaluation. The prognosis and management depend on the site of attachment, anatomical relationships, and the presence of associated malformations, particularly congenital heart defects, which can be life-threatening.