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Structures used to calculate the total orbital volume in T1-weighted (A) coronal and (B and C) sagittal images. IOM, inferior oblique muscle; IRM, inferior rectus muscle; LRM, lateral rectus muscle; MRM, medial rectus muscle; ON, optic nerve; SOM, superior oblique muscle; SRM-LPSM, superior rectus-levator palpebrae superioris muscle complex.
