Posterior fossa dermoid cysts causing cerebellar abscesses.

Area of Science:

• Neurology
• Pediatric Neurosurgery
• Dermoid Cysts

Background:

• Dermoid cysts are uncommon tumors, with posterior fossa involvement being particularly rare.
• Posterior fossa dermoid cysts can lead to serious complications such as cerebellar abscess formation.

Observation:

• This report details two pediatric cases of posterior fossa dermoid cysts associated with dermal sinus tracts, resulting in multiple cerebellar abscesses.
• One patient presented with significant hydrocephalus, requiring ventriculoperitoneal shunting.
• Subtle congenital dermal abnormalities, like pinpoint dimples, were noted in the suboccipital region upon retrospective examination.

Findings:

• Both patients received antibiotic treatment and surgical excision of the posterior fossa dermoid cysts.
• Post-operative outcomes were generally positive, with both children achieving normal neurological status.
• One patient with ventriculoperitoneal shunting experienced a mild learning difficulty 133 months post-surgery.

Implications:

• Early identification of congenital dermal abnormalities along the craniospinal axis in newborns is vital for timely intervention.
• Surgical excision is the primary treatment for dermoid cysts to prevent recurrence and complications.
• Radical excision is recommended, though subtotal excision may be considered when cysts adhere to critical neural structures.