Obsessive–compulsive Disorder in a Young Girl with Subependymal Heterotopia, Aqueductal Stenosis, and Mega Cisterna Magna Along with Left-sided Mild Cerebellar Hypoplasia

Gray matter heterotopia (GMH) is a rare disorder in the general population, but recent attention to its psychiatric aspects encouraged us to introduce a patient with a form of gray matter heterotopia, who suffers from the anatomical abnormalities with a variety of psychiatric disorders. During the late teenage years or early adulthood, a wide variety of neuropsychiatric symptoms may be present, which can lead to diagnostic difficulties. The Dandy–Walker variant is a milder form of the Dandy–Walker complex and is characterized by normal-sized posterior fossa, mild vermian hypoplasia, and a cystic lesion that communicates with the fourth ventricle. This syndrome has been described in association with schizophrenia, obsessive–compulsive disorder (OCD), manic episode, psychosis, and recurrent catatonia. Presenting a case report of an 11-year-old girl with OCD who was accidentally detected with the presence of GMH along with aqueductal stenosis, mega cisterna magna, and left-sided mild cerebellar hypoplasia.