Introduction to neuronavigation surgery Intracerebral lesions are often surrounded by many important functional areas in charge of memory, language, or sensory and motor functions, and are often surrounded by many important vascular nerves, so it is difficult to avoid important areas while precisely reaching the location of the lesion during surgery. Although conventional microsurgery can be effective, it is likely to be accompanied by a large area of exploration and even difficulty in finding the lesion intraoperatively, which may lead to serious postoperative complications. The CYGNUS-PFS electromagnetic navigation system introduced by Compass can precisely navigate the surgical area in real time, avoiding important functional areas that cannot be distinguished under the microscope and following the set surgical path directly to the target of the lesion. What are the advantages of neuronavigation surgery? 1. preoperative design of the surgical plan (selection of the most convenient and safe surgical approach); 2. accurate determination of the real-time 3D position of the surgery (where are we now); 3. display of the structures around the surgical field (what important structures are around); 4. indication of the spatial relationship between the current surgical position and the target and real-time adjustment (in what direction should we advance); 5. display of the surgical approach Show the important structures that may be encountered (what is along the way and how to avoid important nerves and blood vessels); 6. Show the extent of lesion resection. In conclusion, with the help of neuronavigation systems, neurosurgeons can improve the quality of existing surgeries and make modern neurosurgery tend to be more minimally invasive and safer.