A case of orbital myositis with blepharoptosis demonstrating the swelling of superior levator palpebrae muscle on magnetic resonance images

A 51-year-old woman developed diplopia and left blepharoptosis with an insidious onset. On orbital MRI, the extraocular and a left superior levator palpebrae muscles were swollen and enhanced by gadolinium, suggesting orbital myositis. The left blepharoptosis was improved two weeks and the swelling of superior levator palpebrae muscle one month after prednisolone administration. This is the first report that the lesion of superior levator palpebrae muscle was demonstrated by MRI in orbital myositis.