Version May 2024
| Communicating hydrocephalus |
| Permanent impaired absorption: |
| Primary congenital hydrocephalus |
| Malformed brain |
| Developmental/genetic association |
| Secondary prenatal hydrocephalus |
| Posthemorrhagic |
| Postinfectious |
| Secondary postnatal hydrocephalus |
| Prematurity-related |
| Posthemorrhagic |
| Postinfectious |
| Venous congestion: craniosynostosis, achondroplasia |
| Venous thrombosis: superior vena cava obstruction after cardiac surgery |
| Increased secretion: Choroid plexus papilloma/carcinoma |
| Communicating hydrocephalus with an obstructive component |
| Tumors |
| Intraventricular hemorrhage resulting in a clot at aqueduct or fibrosis of aqueduct (acute phase)* |
| Intraventricular hemorrhage resulting in intracranial cysts (acute phase)* |
| Infection resulting in intracranial cysts |
| Meningitis/encephalitis resulting in secondary obstruction* |
| Chiari 2 malformation |
| Dandy Walker malformation |
| Holoprosencephaly: lobar, semilobar, alobar |
| Encephalocele |
| Lissencephaly |
| Hydranencephaly |
| Obstructive hydrocephalus with a transient minor communicating component |
| Subacute or late phase (at least several months from the primary insult) of disorders due to hemorrhage or infection as listed above under "Communicating hydrocephalus with an obstructive component"* |
| Large arachnoid cysts |
| Chromosomal abnormalities, syndromic, genetic: |
| X-linked hydrocephalus (mostly aqueductal stenosis) |
| Osteogenesis imperfecta |
| Craniofacial syndromic disorders |
| Part of metabolic inherited disease: |
| Hurler's disease (MPS T1) |
| Achondroplasia |
| Obstructive hydrocephalus (pure) |
| Intracranial cysts with no evidence of bleed at diagnosis |
| Triventricular hydrocephalus due to radiologically apparent aqueductal stenosis |
| Membranous obstruction of aqueduct |
| Asymmetrical hydrocephalus, due to atresia of the foramen of Monro |
| Obstruction of fourth ventricle outlets |
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