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Use of Magnetic Resonance Imaging for Evaluating Patients With Strabismus (Abstract)


Bucharest, Romania



Background: Dynamic magnetic resonance imaging (MRI) describes sets of static MRI images acquired with the eyes in different gaze position.

Material and methods: 15 patients were referred to us with suspicion of slipped or ‘”lost” medial rectus (MR), 14 after strabismus surgery and 1 after trauma. All the patients had absent adduction past the midline and 7 underwent dynamic MRI examination. One patient had “A” pattern exotropia, 3 prior surgeries, over depression in adduction

Results: The dynamic MRI showed the MR retracted posterior from the normal insertion and a contractile thickening on attempted adduction. All patients underwent surgery, according to deviation, length of the pseudo-tendon, stiffness of the MR, lateral rectus (LR) contracture: All the slipped muscles were found and re-attach to the globe. In the “A” pattern exotropia MRI showed superior displacement of the LR pulleys, corrected by bilateral MR resection with up-shift.

Conclusions: MRI is an index of functional muscle contractility and precise muscle location. It should be considered in complex cases of strabismus for the predictability of the results.

Key words: dynamic MRI, slipped or ”lost” muscle, heterotropic pulleys, cross-sectional area, muscle contractility.


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