Imaging Characteristics of Colloid Cysts: A Case Series Correlating Cyst Size and Location With Associated Acute Hydrocephalus.

This retrospective study evaluates the diagnostic role of CT and MRI in identifying colloid cysts and assessing their association with hydrocephalus. Data from 30 patients diagnosed with third ventricular colloid cysts at Jagadguru Jayadeva Murugarajendra Medical College, Davangere, between 2017 and 2024 were reviewed. Imaging characteristics, including cyst size, location, and potential complications such as hydrocephalus, were analyzed. Colloid cysts larger than 10 mm, located in high-risk regions, and observed in younger patients were more likely to develop complications, including acute hydrocephalus. Asymptomatic cysts exceeding 10 mm in high-risk zones warrant regular imaging follow-up and timely surgical intervention, if necessary, to prevent sudden clinical deterioration. The findings highlight MRI's superiority in demonstrating signal characteristics, cyst contents, and subtle variations, making it valuable for planning management strategies. Overall, larger cyst size and high-risk anatomical positioning strongly correlate with symptomatic presentation and complications, emphasizing the importance of early identification, imaging-based risk stratification, and vigilant monitoring to prevent catastrophic outcomes.