Magnetic resonance imaging of unilateral vertical retraction syndrome with atypical strabismus

We report two patients with unilateral vertical retraction syndrome. Magnetic resonance imaging （MRI） of the orbits of the two cases showed similar size and location of the orbital structure, but with dramatically different strabismus type. MRI sagittal reconstruction of the orbits suggested that abnormal muscle tissue arised from the inferior rectus, which might be associated with retraction and narrowing of the palpebral fissure and atypical strabismus as well.