en گزارش موردي Case Reports <p style="text-align: justify;"><strong>Objectives:</strong>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.</p> <p style="text-align: justify;"><strong>Methods:</strong>Three times measurement with Autism Treatment Evaluation Checklist was performed to measure severity of symptoms and compare treatment outcomes.</p> <p style="text-align: justify;"><strong>Results:</strong> The outcome showed great improvements after pharmacotherapy.</p> <p style="text-align: justify;"><strong>Discussion:</strong> 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.</p> Landau kleffner syndrome, Acquired aphasia, Autism, Occupational therapy, Differential diagnosis, Autism treatment evaluation checklist 72 75 http://irj.uswr.ac.ir/browse.php?a_code=A-10-289-1&slc_lang=en&sid=1 Mohsen Jekan m.jekan@uswr.ac.ir No University of Social Welfare and Rehabilitation Sciences, Tehran, Iran. Seyed Ali Hosseini alihosse@gmail.com Yes University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.