Objectives:The aim of this single case study is to describe a child with Landau Kleffner Syndrome who misdiagnosed as a child with autism spectrum disorder. We also explore occupational therapy`s role in correct process for diagnosis and treatment.

Methods:Three times measurement with Autism Treatment Evaluation Checklist was performed to measure severity of symptoms and compare treatment outcomes.

Results: The outcome showed great improvements after pharmacotherapy.

Discussion: Results of this study indicated that correct diagnosis, early detection and early intervention in this disorder are essential to reach a proper treatment. Of course, therapeutic team work is crucial as well. Occupational and speech therapy interventions can also been recommended as a helpful treatment to improve social and sensory-motor and communicative skills. Parent`s consultation should not be ignored to decrease parental stress.