. The MRI and CT images are used in neurosurgery for planning the surgery and also used in image guidance systems. The 3D models are formed from these imaging techniques and a better understanding of the pathology and the best possible surgical approach can be made possible. Spiral CT angiography yields enough topographical information for the accurate planning of stereotactic surgery for brain lesions. The intra operation MRI also helps in reducing the mistakes in the surgery. The three-dimensional imaging can also be used for training the novice neurosurgeons.