A 49-year-old woman with generalised lichen sclerosus et atrophicus and morphoea developed bilateral Brown's syndrome. Some of the skin lesions were in the vicinity of the trochlea. A characteristic feature of morphoea is subcutaneous fibrosis, so we postulate that the cause of the Brown's syndrome was mechanical tethering of the superior oblique tendon by deep subdermal fibrosis. Histopathological diagnosis was made from biopsies of similar lesions on the patient's face.
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