A "herniation secondary to raised ICP" means that a part of the brain is being pushed through openings in the skull, causing a herniation, due to increased intracranial pressure (ICP), which is essentially elevated pressure inside the skull; this is considered a medical emergency as it can lead to severe neurological damage or death if not treated promptly. Key points about herniation secondary to raised ICP: Mechanism: When pressure inside the skull rises significantly, it can force brain tissue to displace through natural openings in the skull, compressing vital brain structures like the brainstem. Causes of raised ICP: Brain tumors Intracranial hemorrhages (bleeding in the brain) Severe head injuries Brain swelling (cerebral edema) Stroke Infections within the brain