Myositis

This a special form of orbital pseudotumor in which the lymphatic infiltration primarily involves one or more ocular muscles. Aside from significant pain during motion, symptoms include limited ocular motility with double vision (diplopia). Depending on the extent of the myositic changes, exophthalmos with chemosis and eyelid swelling may also be present. Ultrasound studies (Fig. 15.6) will reveal thickening of the ocular muscles with tenonitis (inflammation of Tenon's capsule).

H In Graves' disease, only the muscle belly is thickened. In myositis, the entire muscle is thickened.

— Diagnosis of myositis.

— Diagnosis of myositis.

Fig. 15.6 The ultrasound image (B-mode scan) shows thickening of the entire hypoechoic rec-tus medialis (arrow).
Stretch Marks

Stretch Marks

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