A low-density shadow is found on the left side of the brain. It cannot be determined whether it is cerebral infarction or tumor. What kind of examination should be done for differential diagnosis?

1. Imaging examination: In addition to the judgment of clinical symptoms, with the advancement of science, imaging examination can quickly and increase the accuracy of brain tumor diagnosis, and is also very helpful for postoperative follow-up treatment. Current imaging examinations include: Computed Tomography (CT), Magnetic Resonance Imaging (MRI), Electroencephalography (EEG) and cerebrovascular photography.

2. Biopsy: Although with the advancement of imaging examinations, doctors can often diagnose brain lesions through imaging examinations, but in some cases, biopsy is needed to confirm the pathological diagnosis, especially in cases of brain tumors. When the assessment is that surgical resection is impossible, biopsy surgery can help with subsequent treatment. Currently, biopsy examinations include stereotaxic biopsy and craniotomy biopsy.