Catatonia induced by idiopathic hypertrophic pachymeningitis

We describe the case of a 63-year-old woman with catatonia induced by idiopathic hypertrophic pachymeningitis (IHP). The patient was treated for IHP with prednisolone for approximately 1 year. When she presented with catatonia, no significant changes could be detected by magnetic resonance imaging (MRI) compared with the previous imaging results; electroencephalography (EEG) revealed a delta-wave focus over the left frontotemporal region. High-dose steroid therapy was effective in resolving the catatonic symptomatology and EEG abnormality.