Abducens nerve is present in patients with type 2 Duane's retraction syndrome.

Abstract

To determine whether the abducens nerve is present in patients with type 2 Duane's retraction syndrome (DRS). Retrospective, observational case series. Twelve consecutive patients diagnosed with type 2 DRS. A retrospective review of medical records of ophthalmologic examination and thin-sectioned magnetic resonance imaging (MRI) at the brainstem level and the orbit was performed on 12 patients who showed the typical signs of type 2 DRS, including adduction deficit; globe retraction; narrowing of fissure on adduction; and upshoot, downshoot, or both. Presence of the abducens nerve and any other extraocular muscle abnormalities discovered by MRI scan. Magnetic resonance imaging revealed the presence of the abducens nerve in all the affected eyes (n = 13) of 12 patients with type 2 DRS. The abducens nerve is present on the affected side in type 2 Duane's retraction syndrome.