Chronic subdural hematoma (CSDH) is a common pathology in daily neurosurgical practice that usually develops in older people due to brain atrophy related to age, being rare in young people. We report the case of a patient of 16 years with a HSDC formed a left temporal congenital arachnoid cyst, which
simulated a meningioma plane, which was operated by craniotomy and resection of membranes, and its postoperative course was favorable Young people may also have HSDC if they have similar conditions that favor developmentof chronic subdural hematoma in the elderly, such as a congenital arachnoid cyst, which is a major risk factor for chronic hematoma in young and should be considered in the differential diagnosis of these lesions. Surgical treatment may be performed by trephination and irrigation or by craniotomy.