In medicine, a<unk>  (colloquially known as a spinal tap) is a diagnostic and at times therapeutic procedure that is performed in order to collect a sample of cerebrospinal fluid (CSF) for biochemical, microbiological, and cytological analysis, or—rarely—to relieve increased intracranial pressure. This procedure can also be very painful.
Lumbar puncture
Confusion CT
Confusion MRI
Neuroimaging
Magnetoencephalography
Tension headache CT
Electroencephalography
Transcranial magnetic stimulation