Colloid cyst of the third ventricle
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A rounded hyperdense lesion located near the interventricular foramina of Monro. Although the bodies of the lateral ventricles are prominent, the temporal horns remain small, the brain sulci are not effaced and there is no transependymal oedema to suggest acute obstructive hydrocephalus.
Colloid cyst of the 3rd ventricle typically seen as a well defined, unilocular rounded lesion at the roof of the 3rd ventricle. They are typically hyperdense and calcification is uncommon.
- Waggenspack GA, Guinto FC. MR and CT of masses of the anterosuperior third ventricle. AJR Am J Roentgenol. 1989;152 (3): 609-14. AJR Am J Roentgenol (abstract) - Pubmed citation