Elevation deficit caused by accessory extraocular muscle.

Valmaggia, C; Zaunbauer, W; Gottlob, I · Am J Ophthalmol · 1996

case_report · Level V

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Abstract

To report an elevation deficit, which was caused by an accessory extraocular muscle, in a 6-year-old boy. Computed tomography and magnetic resonance imaging were used to confirm an accessory, fusiform, well-defined, solid structure in the retrobulbar space. A supernumerary intraconal muscle was detected between the annulus of Zinn and the posterior part of the left globe. This rare anomaly may represent an atavistic retractor bulbi muscle.

Medical subject headings