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Posttraumatic intradiploic arachnoid cyst of the posterior fossa

J F Martínez-Lage1, M Martínez Pérez, R Domingo

  • 1Regional Neurosurgical Service, Virgen de la Arrixaca University Hospital, National Health Service, Murcia, Spain.

Child'S Nervous System : Chns : Official Journal of the International Society for Pediatric Neurosurgery
|May 1, 1997
PubMed

Insights

A rare case of a posttraumatic intraosseous arachnoid cyst in a child was successfully treated surgically. This occipital bone lesion highlights the importance of considering skull fractures in diagnosing such rare pediatric masses.

Area of Science:

  • Pediatric Neurosurgery
  • Neuroradiology
  • Skeletal Radiology

Background:

  • Intraosseous arachnoid cysts are rare lesions, often associated with skull defects.
  • Occipital bone leptomeningeal cysts are infrequently reported, with most linked to prior trauma.
  • This case involves a 5-year-old girl presenting with a growing suboccipital mass.

Observation:

  • A 5-year-old girl presented with a growing suboccipital mass.
  • Diagnostic imaging revealed an intradiploic arachnoid cyst and an extra-axial occipital pouch.
  • Communication between the cyst and pouch was noted through an osseous and dural defect.

Findings:

  • Surgical intervention resulted in a favorable outcome for the patient.
  • The lesion was characterized as a posttraumatic intraosseous arachnoid cyst.
  • Literature review identified only seven prior cases of occipital bone leptomeningeal cysts.

Implications:

  • This case expands the understanding of rare intraosseous arachnoid cyst presentations.
  • The findings support a pathogenetic hypothesis linking arachnoid cyst growth to meningocencephaloceles.
  • Early diagnosis and surgical repair are crucial for managing these complex congenital or posttraumatic skull base lesions.

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