Rectus Extraocular Muscle Size and Pulley Location in Concomitant and Pattern Exotropia.

ABSTRACT:

Purpose

To determine whether rectus extraocular muscle (EOM) sizes and pulley locations contribute to exotropia, we used magnetic resonance imaging (MRI) to measure these factors in normal control participants and in patients with concomitant and pattern exotropia.

Design

Prospective case-control study.

Participants

Nine patients with concomitant exotropia, 6 patients with pattern exotropia, and 21 orthotropic normal control participants.

Methods

High-resolution surface-coil MRI scans were obtained in contiguous, quasicoronal planes. Rectus pulley locations were determined in oculocentric coordinates for central gaze, supraduction, and infraduction. Cross sections in 4 contiguous image planes were summed and multiplied by the 2-mm slice thickness to obtain hori

SUBMITTER: Hao R 

PROVIDER: S-EPMC4995140 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature