Subdural hematoma is a volumetric accumulation of blood, located between the solid and arachnoid medullary membranes and causing compression of the brain. The vast majority of subdural hematomas are formed as a result of craniocerebral trauma. Much less often they arise in the vascular pathology of the brain (for example, hypertension, arterial aneurysms, arterio-venous malformations, etc.), and in some cases are the result of taking anticoagulants.