The most common type of high-density shadow in the brain is cerebral hemorrhage, and there are also calcified foci that show high-density shadow, but the density values on CT are different. In case of brain 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 impairment, and numbness of the limbs, hemiparesis of the limbs, etc. In this case, it should be considered an acute cerebral hemorrhage and needs to be treated actively. In the acute stage, dehydration should be given to lower the cranial pressure, and blood pressure should be strictly controlled to prevent further bleeding, while active treatment should be given for 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.