What is the reason for the uneven density of the brainstem? If the brainstem is inflamed, the density of the brainstem can be blurred and uneven on CT or MRI; secondly, brainstem infarction, if there is brainstem infarction, it can easily be combined with post-infarction hemorrhage transformation, which can also appear as a mixture of low and high density and uneven density on CT; thirdly, brainstem hemorrhage. If there is a hemorrhage in the brainstem, if it is in the recovery period, it can also appear as a mixture of high-density and low-density foci when reading the CT film, and the density is not uniform; fourthly, if there is a tumor in the brainstem, if there is a calcification in the middle of the tumor or a hemorrhage in the middle of the tumor, it is called a tumor stroke, and it also appears as a non-uniform density on CT. Therefore, the density is not uniform in the brainstem, mainly due to the above reasons.