Two days earlier, she underwent an LP (opening
pressure of 30 cm H2O with removal of 15 mL of
cerebrospinal fluid [CSF]) to relieve an acute exacerbation
of a headache typical in nature to her chronic
IIH. However, within 24 hours after this LP, she developed
a different type of headache that she described
as localized to the right retro-orbital region, constant,
and “the worst headache of my life.” Review of
systems and the physical exam were otherwise unremarkable.