A 34 year old man presents with multiple episodes of intense, sharp, right-sided facial pain which last for about a minute and occur around ten times a day; these first started 2 months ago. The pain is worst over the nasolabial groove and is precipitated by brushing his teeth, shaving, washing his face, eating, and talking. His medical and surgical histories are unremarkable.
The brain and intracranial vasculature appear normal.
You realize that a nerve biopsy is probably not indicated here.
The CSF analysis is within normal parameters.
Total protein: 5.1 g/dL (6.3 - 7.9) AST: 56 U/L (8 - 48) ALT: 78 U/L (7 - 55) PT: 10.2 s (9.5 - 13.8) Bilirubin: 0.9 mg/dl (0.1 - 1.0)