A 10-year-old female patient presented with altered sensation on right side of the face (area distributed by a maxillary division of trigeminal nerve) since 2 months and hyperpigmented pinpoint to pinhead sized multiple spots, again confined to the maxillary division of trigeminal nerve.) The patient was examined and found hyperesthesia to fine touch. Even air blow on affected part resulted in painful sensations. The pain was associated with lacrimation of right eye. MRI was done and the report shows the presence of loop of artery indenting right trigeminal nerve at the cerebellopontine cistern.

Patient has completed the course of acyclovir (to rule out the possibility of herpetic neuralgia) but did not show improvement. The patient is taking carbamazepine 200 mg once a day at present and feels a significant reduction in symptoms. What should be the further plan for this case? For how…