Thyroid associated orbitopathy
Bilateral proptosis and diplopia.
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There are bilateral symmetrical swelling and enlargement of extraocular muscle bellies, (both inferior and medial rectus muscles and to lesser degree superior rectus complex), sparing tendons.
They appear isointense in t1_vibe and hyperintense on T2W images and shows homogenous enhancement in t1_vibe post-contrast.
They cause regional mass effect, splaying optic nerve on the left side.