Fig. 1

Orbital MRI of a 58-year-old male with TAO. a-b Axial T1- and T2-weighted imaging shows the orbit. c,d Coronal T2- and T1-weighted imaging shows the quantitative measurements of the EOMs. e ADC map shows the quantitative measurements of the EOMs.The number from 1 to 4 represent medial rectus, superior rectus, lateral rectus and inferior rectus respectively.MRI, magnetic resonance imaging;TAO, thyroid associated ophthalmopathy; EOMs, extraoclar muscls; ADC, apparent diffusion coefficient