Simplistic representation of a stereotactic<unk>  Procedures are categorized into stereotactic, needle, and open. Stereotactic is the least invasive and open is the most invasive. When an abnormality of the<unk>  is suspected, stereotactic (probing in three dimensions)<unk>  needle biopsy is performed and guided precisely by a computer system to avoid serious complications. A small hole is drilled into the skull, and a needle is inserted into the<unk>  tissue guided by computer-assisted imaging techniques (CT or MRI scans). Historically, the patient's head was held in a rigid frame to direct the probe into the<unk> ; however, since the early 1990s, it has been possible to perform these biopsies without the frame. Since the frame was attached to the skull with screws, this advancement is less invasive and better tolerated by the patient. The doctor (pathologist) prepares the sample for analysis and studies it further under a microscope.
Brain biopsy
Meningeal biopsy
Hemoencephalography
Cranioscopy
Lumbar puncture
Stereoelectroencephalography
CSF tap test
Ultrasound-guided lumbar puncture