Ossified pseudomeningocele following Chiari decompression surgery in a patient with Kleeblattschädel deformity

Area of Science:

• Pediatric Neurosurgery
• Medical Genetics
• Skeletal Dysplasias

Background:

• Kleeblattschädel (cloverleaf skull deformity) is a rare craniosynostosis syndrome.
• Chiari malformation Type I is a common hindbrain anomaly.
• Pseudomeningocele is a cerebrospinal fluid collection that can occur after neurosurgery.

Observation:

• A 3-year-old child with Kleeblattschädel and Chiari malformation Type I developed an ossified pseudomeningocele post-posterior fossa decompression.
• This represents the first reported instance of a postoperative ossified pseudomeningocele in a patient with Kleeblattschädel.
• It is also the only reported case of an ossified pseudomeningocele occurring outside the lumbosacral region.

Findings:

• The ossified pseudomeningocele is a rare postoperative complication.
• A genetic predisposition for ossification is suggested by the patient's history of premature cranial suture closure.
• This case highlights a unique presentation of pseudomeningocele in a complex pediatric neurosurgical context.

Implications:

• This case expands the understanding of pseudomeningocele complications in pediatric neurosurgery.
• It suggests a potential genetic link to ossification in pseudomeningoceles, particularly in syndromic craniosynostosis.
• Further research into the pathogenesis of ossified pseudomeningoceles is warranted, especially in rare skull deformities.