A Challenging Diagnostic Process: A Case of Lewy Body Dementia in Long-Standing Schizophrenia.

Lewy body dementia (LBD) is a progressive neurodegenerative disorder presenting with a wide range of cognitive, sleep, neuropsychiatric, motor, and autonomic symptoms. Diagnosing LBD in individuals with established psychiatric conditions, particularly chronic schizophrenia, presents significant challenges due to overlapping clinical features. This case report outlines a case of a 78-year-old woman with a 48-year history of paranoid schizophrenia, who on her last admission exhibited new behavioural and functional decline.