Abstract: Synkinesis of the extraocular muscles forms a subset of congenital ocular motility abnormalities termed congenital cranial dysinnervation disorders. Synkinesis most frequently involves the abducens or oculomotor nerves and rarely the trochlear nerve. Only 3 such patients have been described in the literature. We report an isolated case of trochlear–oculomotor synkinesis in a healthy 6-year-old boy and discuss the proposed pathophysiology of this disorder.
Department of Ophthalmology, Western University, London, Ontario, Canada.
Address correspondence to Lulu L. C. D. Bursztyn, MD, MSc, Ivey Eye Institute, St Joseph's Hospital, 268 Grosvenor Street, London, Ontario, Canada N6A 4V2; E-mail: firstname.lastname@example.org
The authors report no conflicts of interest.