https://www.selleckchem.com/products/gsk3368715.html After a follow up of 8 months, impulse control, psychotic symptoms and aggression improved significantly. Since the specific gene mutation of LFS was not determined in our case, we solely had to depend on clinical evaluation and genetic analysis. Although it is not easy to fully define or classify these syndromes, we believe every reported case will be a step in overcoming these difficulties.Factitious disorder imposed on another, also known as Munchausen Syndrome by Proxy (MSBP), is a serious form of child abuse that is difficult to diagnose. In general, signs and symptoms are fabricated or produced by the mother or the caregiver. Delay in diagnosis may cause serious morbidity and mortality. Here, we present the case of an 18-month-old boy who was admitted to the Paediatric Infection Clinic with a diagnosis of acute gastroenteritis. When on intravenous fluid therapy, he developed high fever and subsequently, polymicrobial growth was determined in his blood. He was later diagnosed with MSBP. Despite being a rare condition, MSBP is a disorder that is often overlooked and may have fatal outcomes. Early diagnosis is very important in this disorder, which is considerably difficult to diagnose. In suspected cases, interdisciplinary team work is necessary to prevent adverse consequences. Autism spectrum disorders (ASD) are neurodevelopmental disorders of early childhood which are characterized by limited social-emotional reciprocity and restricted, repetitive patterns of interest and behaviors. The pathophysiology of ASD has not been fully elucidated. Dysregulation of circadian rhythm and melatonin might play a role in ASD pathogenesis. This article aims to review the relationship between melatonin, circadian rhythm and ASD in detail. Articles published in the PubMed database between 1990- 2019 were reviewed and prominent studies in the scope of the review were included. Decreased melatonin levels were detected frequent