A 26 year old female presents with a
history of headaches of several weeks duration. The headaches are most severe
in the morning and are accompanied by a feeling of nausea. She had no
significant past medical history. She had been on the oral contraceptive pill
for the last four years.
On examination she was obese; her
blood pressure was 120/80. On examination of her eyes she was noted to have an
enlarged blind spot and she had bilateral papilloedema.
A non-contrast CT scan of her head did
not reveal any abnormalities.
In this patient which one of the
following investigations would you arrange in order to elucidate the diagnosis
and exclude any underlying conditions?
MRI of the brain with MR venography
Blood gas analysis
Visual evoked potentials
CT scan of the chest