[Chronic hematoma in Dandy-Walker cyst].

Area of Science:

• Neurology
• Radiology
• Pediatric Neurosurgery

Background:

• Dandy-Walker malformation is a congenital brain abnormality.
• Posterior fossa cysts can present with varied clinical and imaging findings.
• Intracystic hemorrhage is an uncommon complication.

Observation:

• A rare case of Dandy-Walker cyst in the posterior fossa with chronic intracystic hemorrhage is presented.
• Serial non-contrast computed tomography (CT) scans revealed only cyst enlargement.
• A contrast-enhanced CT scan was essential for definitive diagnosis.

Findings:

• The study highlights the diagnostic utility of contrast-enhanced CT in complex posterior fossa lesions.
• Non-contrast imaging may underestimate the complexity of Dandy-Walker cysts.
• Chronic hemorrhage within the cyst was identified as a key diagnostic feature.

Implications:

• Accurate diagnosis of Dandy-Walker cysts with complications is vital for appropriate management.
• Contrast-enhanced CT should be considered in the evaluation of posterior fossa cysts with atypical progression.
• This case underscores the importance of advanced imaging techniques in neurosurgical diagnostics.