acute hemorrhagic encephalitis acute hemorrhagic leukoencephalitis https://rarediseases.info.nih.gov/diseases/8629/acute-hemorrhagic-leukoencephalitis https://www.malacards.org/card/acute_hemorrhagic_leukoencephalitis AHL MONDO:0011716 SCTID:72986009 EFO:0007132 NCIT:C84535 GARD:0008629 acute hemorrhagic leukoencephalitis OMIM:606752 AHLE UMLS:C0014077 MESH:D004684 ICD9:136.9 Acute hemorrhagic leukoencephalitis(AHL) is a veryrareform of acute disseminated encephalomyelitis that usuallyresults indeath. It is characterized by a brief but intense attack of inflammation in the brain and spinal cord that damages the myelin -- the protective covering of the nerve fibers. It may also cause bleeding in the brain, leading to damage of the white matter. Symptoms usually come on quickly, beginning with symptoms such as fever, neck stiffness, fatigue, headache, nausea vomiting,seizures, and coma.AHL has a very poor prognosis, with rapid deterioration and death usually occurring within days to one week after onset of symptoms because of severe inflammation in the brain. Although the exact cause is unclear,AHL usually followsaviral infection, or less often, vaccination for measles, mumps, or rubella. Some researchers think that an infection or vaccination can initiate an autoimmune process in the body thus leading to AHL. MEDGEN:4937 DOID:10992 acute disseminated encephalomyelitis