Mild ring enhancement indicates that there is a ring of contrast medium around the lesion that appears to be slightly concentrated, suggesting that the blood supply in the area is richer, which may generally occur in tumors, infections, and demyelinating diseases. 1. Tumor: Tumor is one of the most common causes of annular enhancement, usually in malignant glioma, metastases and meningiomas, which are benign tumors, may also show annular enhancement. 2. Infection: Infection can also cause ring-shaped reinforcement, such as common brain abscess, brain parasites, tuberculosis tumor, fungal infections may cause ring-shaped reinforcement. 3. Demyelinating diseases: Demyelinating diseases can also cause ring-shaped intensification, mainly multiple sclerosis and acute disseminated encephalomyelitis, and patients with cerebral hemorrhage may also experience ring-shaped intensification during the absorption phase. Mild ring-shaped enhancement may also be caused by other reasons, patients need to pay attention, and it is recommended that patients under the guidance of the doctor in conjunction with their own situation for further examination.