Myositis
This a special form of orbital
pseudotumor in which the
lymphatic infiltra-tion primarily
involves one or more ocular muscles. Aside from significant painduring motion, symptoms include limited ocular motility with double vision (diplopia).
Depending on the extent of the myositic changes, exophthalmoswith chemosis and eyelid swelling may also be present. Ultrasound studies (Fig. 15.6) will reveal
thickening of the ocular muscles with tenonitis
(inflam-mation of Tenon’s capsule).
In Graves’ disease, only the muscle belly is
thickened. In myositis, the entire muscle is thickened.
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