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Outcome in children with space-occupying posterior fossa arachnoid cysts
E Boltshauser1, F Martin, S Altermatt
1University Children's Hospital, Zurich, Switzerland. eugen.boltshauser@kispi.unizh.ch
Insights
Posterior fossa arachnoid cysts (PFAC) in infants have a favorable prognosis. Most children treated for PFAC show normal cognitive development and neurological signs, with no epilepsy.
Area of Science:
- Pediatric Neurosurgery
- Neurodevelopmental Disorders
- Cerebellar Malformations
Background:
- Limited prognostic data exists for space-occupying posterior fossa arachnoid cysts (PFAC).
- Existing literature primarily focuses on Dandy-Walker syndrome and cerebellar hypoplasia.
- Symptomatic PFAC often requires surgical intervention in infancy.
Purpose of the Study:
- To describe the long-term outcome of infants treated for symptomatic posterior fossa arachnoid cysts (PFAC).
- To evaluate cognitive development and neurological signs in children with PFAC.
- To contribute to the limited literature on PFAC prognosis.
Main Methods:
- Retrospective case series of 11 children treated for PFAC between 1980-1999.
- Surgical management involved shunting for symptomatic cysts.
- Assessment of neurological status, cognitive ability, and scholastic achievements.
Main Results:
- Cyst locations varied: retrocerebellar (8), supravermian (2), and cerebellopontine angle (1).
- Most patients (9/11) exhibited average or above-average cognitive abilities and scholastic achievements.
- No epilepsy was observed; mild ataxia and cognitive delay occurred in only one patient, potentially linked to surgical complications.
Conclusions:
- Posterior fossa arachnoid cysts (PFAC) generally have a favorable prognosis regarding cognitive development and neurological function.
- Symptomatic PFAC treated in infancy via shunting is associated with positive long-term outcomes.
- Further research is warranted to fully understand PFAC pathogenesis and long-term neurodevelopmental trajectories.
Abstract:
While prognostic information for Dandy-Walker syndrome and non-progressive cerebellar ataxia/cerebellar hypoplasia is available, surprisingly scant literature reports are found for space-occupying posterior fossa arachnoid cysts (PFAC). We describe the outcome of patients with symptomatic PFAC shunted as infants. Only 11 children were seen over a 20-year period (1980-1999). Cyst location was retrocerebellar (n = 8), supravermian (n = 2) and in the cerebellopontine angle (n = 1). Motor and cognitive impairments in one child were interpreted as the result of neurosurgical complications (intraventricular and intracerebral haemorrhage). One 6-year-old boy had mild truncal ataxia and mild cognitive delay. The 9 other patients had no evidence of ataxia or clumsiness and had average, some even above average, cognitive ability and scholastic achievements. Epilepsy was not a feature. We conclude that the prognosis of PFAC for cognitive development and neurological signs is favourable.