Dramatic headache relief after sumatriptan in a patient with a pituitary macroadenoma

We are reporting an interesting case of pituitary macroadenoma. The patient presented with sudden, bifrontal, pulsating headache; photophobia; and an abducens nerve palsy, due to extension of the tumor into the cavernous sinus region. The headache resolved completely after a subcutaneous injection of sumatriptan.