Magnetic resonance imaging of extraocular rectus muscles abnormalities in acute acquired concomitant esotropia

Magnetic resonance imaging of extraocular rectus muscles abnormalities in acute acquired concomitant esotropia

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AIM: To investigate the difference of medial rectus (MR) and lateral rectus (LR) between acute acquired concomitant esotropia (AACE) and the healthy controls (HCs) detected by magnetic resonance imaging (MRI).METHODS: A case-control study.Eighteen subjects with AACE and eighteen HCs were enrolled.

MRI scanning data were conducted in target-controlled central gaze with a 3-Tesla magnetic resonance scanner.Extraocular muscles (EOMs) were scanned in contiguous image planes 2-mm thick spanning the EOM origins to the globe equator.To form posterior partial volumes (PPVs), the LR and MR cross-sections in the image planes 8, 10, 12, and 14 mm posterior to the globe were summed here and multiplied by the 2-mm slice thickness.

The data were classified according to the right eye, left eye, dominant eye, and non-dominant eye, and the differences in mean cross-sectional area, maximum cross-sectional area, and PPVs of the MR and LR muscle in the AACE group and HCs group were compared under the above classifications respectively.RESULTS: There were no significant differences between the two groups of demographic characteristics.The mean cross-sectional area of the LR muscle was click here significantly greater in the AACE group than that in the HCs group in the non-dominant eyes (P=0.

028).The maximum cross-sectional area of the LR muscle both in the dominant and non-dominant eye of the AACE group was signi?cantly greater than the HCs group (P=0.009, P=0.

016).For the dominant eye, the PPVs of the LR muscle were significantly greater in the AACE than that in the HCs group (P=0.013), but not in the MR muscle (P=0.

698).CONCLUSION: The size and volume of muscles dominant eyes of AACE subjects change significantly to overcome binocular diplopia.The LR muscle become larger to compensate for the enhanced convergence in the AACE.