These are a surgical procedure where bone flaps are temporarily removed from the skull to give access to the brain. The bone flaps are created by specialized tools. Sometimes it’s done under the guidance of CT scans or MRI scans to localize the areas of treatment (stereotactic Craniotomy). A craniotomy is used in stereotactic biopsy of the brain, stereotactic radiosurgery & stereotactic aspiration of hematomas, cysts or abscesses. A craniotomy is also useful in aneurysmal clipping and removal of brain tumors. Are of various types, i.e., translabarynthine Craniotomy, retro-sigmoid Craniotomy, extended bifrontal Craniotomy and supra-orbital Craniotomy.