Trigemino-abducens synkinesis: serial review over 4 years.

Congenital cranial dysinnervation disorders involve abberant connections between cranial nerves, often resulting in synkinetic activation of target muscles. Marcus-Gunn jaw winking ptosis and Duane retraction syndrome are some of the more well-known examples of this phenomenon. We present serial video of a child with congenital trigemino-abducens synkinesis, a lesser known congenital cranial dysinnervation disorder, to demonstrate the characteristics of this likely under-diagnosed presentation.