Dense shadows in the brain are most commonly associated with cerebral hemorrhage, and there are also calcified foci that exhibit dense shadows as well, but the density values on CT are different. When a patient’s head CT examination reveals dense shadows in the brain, if it is a cerebral hemorrhage, the patient will have symptoms of acute cerebrovascular disease. For example, the patient will have symptoms such as salivation at the corners of the mouth, unclear spitting or aphasia, as well as headache, visual defects, and limb numbness, limb hemiparesis and other symptoms accompanied by such a case should be considered to be an acute cerebral hemorrhage, and need to be actively to carry out the treatment. In the acute stage, dehydration should be given to lower the cranial pressure, and the blood pressure should be strictly controlled to prevent further bleeding, and at the same time, the patient should be actively treated for the complications. If the patient does not have any neurological symptoms and there is a high density shadow in the brain, it is considered to be caused by old calcified foci.