If there is a mass-like high-density shadow in the left frontal lobe, it may have various causes, such as cerebral hemorrhage, calcified foci, and occupying lesions, etc., which are explained as follows: 1. As age increases, the probability of calcified foci will increase. Physiological calcified foci generally do not require treatment, and there are many causes of pathological calcified foci in the brain, such as intracranial infection, parasitic infection, endocrine and metabolic diseases, etc., which can lead to hyperdense shadows in the frontal lobe. 2. Hematoma caused by cerebral hemorrhage can also show high-density shadow. Cerebral hemorrhage is a more serious disease, and the treatment should be determined in time according to the size and location of the hematoma. 3. Occupying lesions such as brain tumors, brain cysts, arachnoid cysts or pineal cysts can also show high-density shadows. Therefore, the clustered high-density shadow in the left frontal lobe should be based on the examination results to determine the treatment plan, and it is recommended that the patient actively cooperate with the doctor’s treatment.