Delayed psychiatric sequelae following multifocal central nervous system lesions in leptospirosis: A case report.

Leptospirosis is a zoonotic infectious disease that can involve multiple organ systems. Neurological involvement is uncommon, and long-term neuropsychiatric sequelae have rarely been described. We report the case of a previously healthy adult who developed acute leptospiral infection complicated by multifocal central nervous system (CNS) lesions. The patient presented with fever, convulsions, altered mental status. Chest computed tomography (CT) scan revealed diffuse ground-glass opacities and patchy consolidations in both lungs. Brain magnetic resonance (MRI) demonstrated multifocal CNS lesions. Cerebrospinal fluid Metagenomic Next-generation Sequencing (mNGS) confirmed leptospiral infection. The patient received appropriate antimicrobial therapy and recovered fully, with follow-up imaging showing resolution of cortical lesions. Three years later, the patient developed new-onset psychiatric symptoms, including delusions, hallucinations, or personality changes, without evidence of recurrent infection or other organic causes. This case highlights that leptospiral infection may cause multifocal CNS lesions and lead to delayed psychiatric sequelae years after apparent recovery.