MRI
What is the characteristic pattern of extraocular muscle affection in thyroid orbitopathy?
The mnemonic (I'M SLOw) makes it easy to remember: *Inferior rectus *Medial rectus *Superior rectus *Lateral rectus *Obliques (Superior and inferior oblique)
Bilateral symmetrical increased thickness of the medial and inferior rectus muscle bellies, sparing their tendons. The affected extraocular muscles display an intermediate signal in T1 and a slightly higher signal than the other muscles in T2.