Male, 68 years old, preoperative planning examination for colloid cyst removal. An 8 mm, nonenhancing, slightly T2 hypointense nodule is evident within the superior third ventricle centered at the foramina of Monro. No evidence of ventricular dilatation is seen, although the ventricles and sulci are proportionately prominent compatible with underlying volume loss. No enhancing lesions are seen. No evidence of parenchymal edema or mass effect is seen. Patchy mucosal thickening is evident in the paranasal sinuses.
Limited examination for surgical navigation redemonstrates a nodule in the third ventricle at the level of the foramina of Monro compatible with a colloid cyst.