Abnormal MRI signals, in addition to tumors, may also indicate inflammation, bleeding, etc. It is recommended that the diagnosis be confirmed in conjunction with clinical and other examinations. Magnetic resonance imaging (MRI) is an imaging method that utilizes the signals generated by the resonance of atomic nuclei in a magnetic field and reconstructs the images through electronic computer calculations. It can be used to examine the entire body, detecting vascular disease, thyroid disease, neurological disease, etc., and can be used in the clinic to detect many types of lesions. Abnormal MRI signals generally refer to changes in the proportions and composition of tissue cells, or abnormalities that have been replaced by other tissues. It may suggest that the patient has inflammation, hemorrhage, ischemia, infarction, tumor, and so on. There are multiple sequences in MRI, if DWI high signal, it may suggest a tumor, abscess, if low signal is seen on both T2WI and T1WI in the pineal region of the cranium, it may just be normal physiological calcification. Therefore, an abnormal MRI signal is not necessarily a tumor. It should be noted that a single result should not be judged as a certain phenomenon, and it is recommended to consult a doctor in time to confirm the diagnosis.