Intracranial metastases need to be differentiated from brain abscesses, gliomas and meningiomas. Intracranial metastases are mainly differentiated by clinical history and imaging. 1. Intracranial metastatic tumors are often manifested as multiple foci in the brain, often occurring in the corticomedullary junction area, with large edema around the foci, and characteristic ring-shaped enhancement on enhanced scan. 2. patients with brain abscess often have chills and fever, and CT shows clear or unclear hypodense shadow, and after enhancement, complete abscess wall with uniform thickness can be seen, and air-liquid flatness can be seen in some cases. 3. Glioma is an intracerebral tumor, with low density shadow at low grade and insignificant occupying effect, and mixed density at high grade and obvious occupying effect, with typical “wreath-like” enhancement after enhancement. 4. Meningioma is an extracerebral tumor, commonly found in the falx of the brain, with calcification within the tumor, obvious enhancement after enhancement, and the typical “meningeal tail sign”. When intracranial metastatic tumor is suspected, it is necessary to complete relevant examinations in time and standardize the treatment under the guidance of doctors.