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Fig. 1A. —42-year-old woman with Graves' ophthalmopathy. Unenhanced T1-weighted coronal MR image of orbits approximately 1 cm behind posterior pole of globe shows rectus muscles outlined in right orbit. Enclosed area gives A_meas (cross-sectional area) for corresponding muscle. In left orbit, long and short coronal diameters (D_long and D_short) are indicated. Estimated cross-sectional area for each muscle was calculated on basis of these diameters (A_calc = [D_long x D_short x ] / 4).