Isolated lateral rectus myositis.

Orbital myositis is a rare non-granulomatous inflammatory process within the orbit. Grave's disease and lymphoproliferative disorders are considered the most common cause of orbital myositis. The idiopathic form should be considered after exclusion of known causes or associations. Isolated orbital myositis is a very rare form of this disease. We report a case of an isolated lateral rectus myositis to draw the attention of physicians to this condition, as prompt treatment in our patient resulted in complete recovery.