Figure 2: Coronal T2 weighted images (a-c) show the dilated frontal horns along with brain parenchyma herniating through the defect in the cribriform plate. The colloid cyst is seen as a hypointense lesion obstructing the foramen of Monroe and producing lateral ventricular dilatation. Coronal computed tomography image (d) shows the bony defect in the cribriform plate. Sagittal T2 weighted (e) and postcontrast T1 weighted images (f) show the extension of the frontal horn toward the cribriform plate