title: Hidden aqueductal stenosis associated to bilateral idiopathic foramina of Monro stenosis mimicking a Chiari I malformation? Case report.
abstract: A 39-year old man came to our outpatient clinic with long history of unspecific symptoms and signs. Cerebral MRI showed herniation of the cerebellar tonsils of more than 1 cm below the foramen magnum and a triventricular hydrocephalus. A diagnosis of Chiari I malformation was retained. After an osteo-dural decompression of the posterior fossa, post-operative MRI revealed an aqueductal stenosis with triventricular hydrocephalus. An endoscopic-third- ventriculostomy showed an idiopathic stenosis of the right foramen of Monro. Residual symptoms and persistence of biventricular hydrocephalus justified a ventriculo-peritoneal shunt. Aqueductal and foramina of Monro stenosis can mimick a Chiari I malformation.
authors.affiliation: Departement of Neurosurgery, Faculty of Medicine, Geneva University Hospitals, Geneva, Switzerland. b_and@hotmail.com
authors.forename: Andrea
authors.initials: A
authors.lastname: Bartoli
authors.forename: Cristina Diana
authors.initials: CD
authors.lastname: Ghinda
authors.forename: Ivan
authors.initials: I
authors.lastname: Radovanovic
authors.forename: Shahan
authors.initials: S
authors.lastname: Momjian
mesh_terms: D000328:Adult; D001139:Arnold-Chiari Malformation / Q000150:complications / Q000175:diagnosis / Q000601:surgery*; D002552:Cerebral Ventricles / Q000601:surgery*; D019299:Decompression, Surgical / Q000379:methods; D003937:Diagnosis, Differential; D005539:Foramen Magnum / Q000601:surgery*; D006801:Humans; D006849:Hydrocephalus / Q000175:diagnosis / Q000209:etiology / Q000473:pathology / Q000601:surgery*; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D016896:Treatment Outcome; D017287:Ventriculoperitoneal Shunt / Q000379:methods; D014696:Ventriculostomy / Q000009:adverse effects