Headache as a sole manifestation in nonconvulsive status epilepticus.

Nonconvulsive status epilepticus may present with several manifestations, and many of them may not be obvious. The most important for the diagnosis of nonconvulsive status epilepticus is the electroencephalogram pattern. This is a case report of a 9-year-old boy with severe and continuous headache. He received chemotherapy for histiocytosis that was diagnosed when he was 3 years, 6 months years old. He had no evidence of central nervous system histiocytosis involvement or drug toxicity. He was diagnosed with nonconvulsive status epilepticus. The headache and electroencephalogram anomaly disappeared completely when anticonvulsant therapy began. Headache and seizure disorder may coexist, but this may be the first report of nonconvulsive status epilepticus with headache as a sole manifestation.