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Cisternography with isotopes following posterior fossa surgery in children
Insights
Postoperative communicating hydrocephalus after posterior fossa tumor surgery is common, but most children do not require a permanent shunt. Isotope cisternography helps identify children needing intervention, sparing others unnecessary procedures.
Area of Science:
- Neurosurgery
- Pediatric Oncology
- Neurology
Background:
- Posterior fossa tumor surgery can lead to postoperative communicating hydrocephalus in 10-30% of pediatric patients.
- Permanent shunting is only required in a smaller subset (8-18%) of these children.
- Understanding cerebrospinal fluid (CSF) dynamics is crucial for appropriate management.
Purpose of the Study:
- To investigate disturbances in cerebrospinal fluid (CSF) circulation and reabsorption following posterior fossa tumor surgery.
- To identify predictive factors for the necessity of CSF shunting in pediatric patients.
- To differentiate between transient and persistent CSF dynamic abnormalities.
Main Methods:
- Isotope cisternography was performed on 25 children aged 3-12 years, 8-21 days post-operation.
- Assessment of CSF circulation and reabsorption parameters using radiotracer distribution.
- Follow-up examinations were conducted to confirm findings.
Main Results:
- Four out of 25 children (16%) exhibited pathological CSF dynamics requiring a permanent ventriculo-atrial shunt.
- Twenty-one children (84%) showed isotope accumulation in the posterior fossa but had normal CSF circulation and clearance.
- No shunting was necessary for the 21 children with normal CSF clearance, confirmed by long-term follow-up.
Conclusions:
- Isotope cisternography is effective in evaluating CSF circulation and reabsorption after posterior fossa surgery.
- Most children with posterior fossa tumors do not develop persistent hydrocephalus requiring shunting.
- Early identification of pathological CSF dynamics guides the decision for shunt placement, avoiding unnecessary interventions.
Abstract:
Surgery of posterior fossa tumors is afflicted with some important problems. One of these is the postoperative communicating hydrocephalus. According to the literature this form of hydrocephalus is found in 10-30% of all children operated on; but a permanent shunt is necessary in only 8-18%. Aim of the present investigation was to find out disturbances of cerebrospinal fluid (CSF)--circulation and--reabsorption after posterior fossa surgery. Therefore 25 children ranging in the age from 3 to 12 years were examined on the basis of isotope cisternographic studies 8 to 21 after the operation. In 4 cases all parameters of pathological CSF-dynamics were found which required a permanent ventriculo-atrial shunt. 21 children showed a minimal or significant accumulation of the isotope in the posterior fossa but a normal circulation and a sufficient clearance on later scans. In these cases neither a temporary nor a permanent shunt was necessary. These findings are confirmed by follow-up examinations between 2 and 3 years.