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Chiari III Malformation: Quantification of Long-term Outcome After Early Surgery
Oday Atallah1, Joachim K Krauss1, Constantin S von Kaisenberg2
1Department of Neurosurgery, Hannover Medical School, Hannover, Germany.
Insights
Chiari malformation type III presents severe challenges. This case study highlights significant long-term developmental delays and cognitive deficits in a surgically treated infant, emphasizing the need for standardized outcome assessments.
Area of Science:
- Pediatric Neurology
- Congenital Disorders
- Surgical Management
Background:
- Chiari malformation type III is a rare, severe congenital disorder with high mortality and significant neurological deficits in survivors.
- Limited data exists on long-term outcomes and disability quantification following surgical intervention for this condition.
- Prenatal diagnosis poses challenges for counseling and treatment decisions.
Purpose of the Study:
- To present a case of Chiari malformation type III managed surgically in a newborn.
- To propose a standardized test battery for assessing long-term outcomes in affected patients.
- To contribute to understanding the long-term impact and decision-making for this rare condition.
Main Methods:
- Case report of a female newborn diagnosed prenatally with Chiari malformation type III.
- Surgical repair of meningoencephalocele and ventriculoperitoneal shunt placement.
- Long-term developmental and cognitive assessment using standardized tests, including the Behavior Rating Inventory of Executive Function.
Main Results:
- The patient, despite uncomplicated surgery, exhibited marked developmental delay.
- At 40 months, the patient had a total IQ of 65 and significant impairments in memory and metacognitive development.
- The case underscores the severe long-term neurological deficits associated with Chiari malformation type III.
Conclusions:
- Prenatal diagnosis of Chiari malformation type III necessitates careful consideration for parental counseling and treatment planning.
- Standardized, long-term follow-up assessments are crucial for quantifying disability and informing future management strategies.
- Further research documenting postoperative development is essential for improving outcomes in patients with Chiari malformation type III.
Abstract:
Chiari malformation type III is a rare and severe congenital disorder characterized by herniation of posterior fossa contents into a posterior encephalocele and by other abnormalities. It is associated with a high rate of early mortality and survivors suffer from neurologic deficits and mental retardation. There is only very limited data available on long-term outcome after surgery, and in general there is a lack of quantification of disability. In this technical note, we present the case of a female newborn diagnosed already during pregnancy with a Chiari malformation type III. Surgical management and a proposal for comparable standardized test battery for long-term outcome was presented. A caesarean section was performed at 37 + 1 weeks of gestation, followed by surgical repair of the meningoencephalocele and placement of a ventriculoperitoneal shunt. Despite an uncomplicated postoperative course, development was markedly delayed. At the last follow-up at 40 months, the patient exhibited severe deficits, including a total IQ of 65 (below the 1st percentile), along with significant impairments in memory and metacognitive development, as assessed by the Behavior Rating Inventory of Executive Function. The prenatal diagnosis of Chiari malformation type III is a challenge both with regard to parent counseling and treatment decisions. It is necessary to document the postoperative development of these patients with various degrees of disability according to standardized tests on long-term follow-up to gain more insight for future decision-making.
