For patients with brainstem hemorrhage, a head CT generally shows irregular high-density shadows in the brainstem area, which are mostly seen in acute fresh brainstem hemorrhages. When the condition of brainstem hemorrhage is relatively stable, low-density shadows may appear around the high-density shadows, which at this time are considered to be due to the presence of surrounding edema. When the patient's condition is stable, a follow-up CT of the brainstem one to two weeks later often shows a gradual reduction in the density of the original high-density shadows, indicating that the hematoma of the brainstem hemorrhage has entered the hematoma absorption phase. In the later stable condition of the disease, as the hematoma is gradually absorbed, the density will also gradually decrease.