The importance of the brain in the human organism is self-evident, with the progress and development of modern imaging technology, MRI and CT examination of the brain is more and more common, and many people know that they need to do a CT or MRI examination when their head is a little bit uncomfortable. MRI or CT is indeed an effective means of detecting brain lesions, and a lot of lesions can be found through these imaging examinations. One of the categories is brain occupying lesions, what is brain occupying lesions, and are they benign or malignant? Because the cranial cavity is a relatively closed cavity formed in the cranial envelope, brain tissue, cerebrospinal fluid, blood and other normal components are in this cavity, but MRI or CT can sometimes find some abnormal pathologic components are also in this cavity, and form a certain volume, so that the surrounding tissues and structures have a certain degree of compression, which is also known as intracranial space-occupying lesions. Among the occupying lesions in the brain, the most common ones are tumors in the brain, but many non-tumor lesions such as abscesses, granulomas, hematomas, etc. are also occupying lesions in the brain. Therefore, occupying lesions in the brain are actually a general description of many kinds of brain diseases, and further examination and analysis are needed to determine which kind of diseases they are. Because a large portion of space-occupying lesions in the brain end up being confirmed as malignant tumors after surgery, some people are very worried about whether it is a malignant brain tumor after their brain examination reports that it is a space-occupying lesion. In fact, the occupying lesion in the brain is not necessarily malignant even if it is a tumor, and there is still a high chance that it may be a benign tumor. Moreover, there are many space-occupying lesions in the brain that are not tumors at all, and there are even some space-occupying lesions in the brain that don’t even need surgical treatment. Therefore, there is no need to be overly nervous after detecting a space-occupying lesion in the brain. Further imaging or other tests will help to determine the nature of the space-occupying lesion and determine the treatment plan. Occupational lesions of the brain are a generalized term for a wide range of possible diseases of the brain, both benign and malignant. When occupational lesions of the brain are detected, further examination is needed to clarify the possible nature of the occupational lesions, so as to better determine the optimal treatment plan.