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Apical or posterior idiopathic orbital inflammation. (a) T1-weighted axial magnetic resonance image reveals the right lesion in the orbital apex that is isointense with respect to extraocular muscles and cerebral gray matter. (b) The lesion demonstrates marked enhancement after contrast injection. (c) T2-weighted axial magnetic resonance image demonstrates that the lesion is hypointense to isointense with respect to extraocular muscles and cerebral gray matter
