A 32-year-old man presents with a worsening left-sided headache for 1 week. The headache is throbbing in nature and present throughout the day. There is no history of fever, photophobia, nausea, or vomiting. Neither are there sensory disturbances or limb weakness. There is no history of chronic headaches. His medical and surgical histories are unremarkable. He is not on any medications. His family history is unremarkable. There is no history of allergies. A full blood count, ECG, liver functions, and a renal profile are all within normal parameters.