CT and MRI Features of Pediatric-Aged Colloid Cysts: Report of Two Cases

Area of Science:

• Neurology
• Radiology
• Pediatric Neuroimaging

Background:

• Colloid cysts are typically benign tumors found in the third ventricle.
• They can cause obstructive hydrocephalus due to their location at the foramen of Monro.
• Symptoms often include headaches, visual disturbances, and cognitive changes.

Observation:

• Two pediatric cases (a 10-year-old boy and an 11-year-old girl) presented with symptoms suggestive of increased intracranial pressure.
• Brain CT in the boy revealed a hyperdense lesion at the foramen of Monro, causing lateral ventricular dilatation.
• Brain MRI in the girl showed a similar lesion with abnormal signal intensity at the foramen of Monro, leading to ventricular enlargement.

Findings:

• Imaging findings from both CT and MRI were consistent with a colloid cyst of the third ventricle.
• The lesion's location at the foramen of Monro was identified as the cause of obstructive hydrocephalus.
• The characteristic imaging appearance facilitated a definitive diagnosis.

Implications:

• Early and accurate diagnosis of colloid cysts is crucial for timely intervention.
• Neuroimaging plays a vital role in identifying the location and extent of these lesions.
• Understanding the typical presentation aids in managing pediatric hydrocephalus and associated symptoms.