title: [Unilateral cerebellar hypoplasia: an alteration of vascular origin?].
abstract: OBJECTIVE
  To present nine cases of unilateral cerebellar hypoplasia and to show the clinical alterations and the possible etiology.
  
  
  METHODS
  A retrospective analysis of the clinical, radiological and perinatal features of a series of nine infantile cases with unilateral cerebellar hypoplasia was made. The unilateral cerebellar hypoplasia was demonstrated in all patients after computarized tomography or magnetic resonance (MR) studies. Angiographic study was performed in six patients, in most of them by MR arteriography, with demonstration of vascular anomalies in the cerebellar and/or vertebral arteries in most of the patients. However, other types of malformations of the posterior fossa were also observed: retrocerebellar cyst associated with obstruction of the aqueduct (two cases), cutaneous hemangioma or vascular malformation (two cases), and psychomotor retardation (five cases), being this last disturbance the most frequent clinical alteration.
  
  
  CONCLUSIONS
  The unilateral cerebellar hypoplasia is a relatively rare malformation and it is more frequently associated with psychomotor retardation than with cerebellar symptomatology. Hypoplasia or aplasia of the cerebellar arteries, of probable early intrauterine origin, would be the cause of this malformation.
authors.affiliation: Servicio de Pediatría, Hospital Guillermo Almenara Irigoyen, Lima, Peru. pascas@inves.es
authors.forename: V
authors.initials: V
authors.lastname: Granados-Alzamora
authors.forename: S I
authors.initials: SI
authors.lastname: Pascual-Pascual
authors.forename: I
authors.initials: I
authors.lastname: Pascual-Castroviejo
mesh_terms: D002526:Cerebellar Diseases / Q000150:complications / Q000175:diagnosis; D002531:Cerebellum / Q000002:abnormalities* / Q000098:blood supply / Q000000981:diagnostic imaging*; D002536:Cerebral Arteries / Q000002:abnormalities; D002648:Child; D002675:Child, Preschool; D003388:Cranial Fossa, Posterior / Q000002:abnormalities; D005260:Female; D006801:Humans; D007223:Infant; D018810:Magnetic Resonance Angiography; D008297:Male; D011596:Psychomotor Disorders / Q000175:diagnosis / Q000209:etiology; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed
vernacular_title: Hipoplasia unilateral de hemisferio cerebeloso: ¿una alteracion de origen vascular?