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A 42-year-old woman presented with ptosis of the left upper lid and li mitation of elevation and adduction of the left eye. Neuroimaging reve aled a left cavernous sinus lesion which on biopsy proved to be a meni ngioma. She was symptomatically stable for three weeks until she had s pontaneous elevation of her left upper lid and resolution of her diplo pia over the course of one day. Spontaneous improvement of a neurologi c deficit is generally considered evidence against an underlying tumor ; however, it should not rule out the possibility that a tumor is pres ent. (C) 1997 by Elsevier Science Inc.