<unk>  should not be performed in the following situations: * Idiopathic (unidentified cause) increased intracranial pressure (ICP) * Rationale:<unk>  in the presence of raised ICP may cause uncal herniation * Exception: therapeutic use of<unk>  to reduce ICP, but only if obstruction (for example in the third ventricle of the brain) has been ruled out * Precaution * CT brain, especially in the following situations * Age >65 * Reduced GCS * Recent history of seizure * Focal neurological signs * Abnormal respiratory pattern * Hypertension with bradycardia and deteriorating consciousness * Ophthalmoscopy for papilledema * Bleeding diathesis (relative) * Coagulopathy * Decreased platelet count (9/L) * Infections * Skin infection at puncture site * Vertebral deformities (scoliosis or kyphosis), in hands of an inexperienced physician.
Lumbar puncture
Ultrasound-guided lumbar puncture
Brain biopsy
Hemoencephalography
Cranioscopy
CSF tap test
Meningeal biopsy
Intracranial pressure monitoring