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Colloid Cyst (CC)

Last Updated: March 27, 2020

Figure 1: Because colloid cysts are typically filled with a highly proteinaceous fluid, they are often dense on CT (top row left) and hyperintense on T1WI (top row right). Colloid cysts should have no internal enhancement on T1WI post contrast images (bottom). This colloid cyst is in the classic location at the foramen of Monro.

Figure 2: Sagittal (top row left) and axial (top row right) T1 images demonstrate a low signal intensity colloid cyst at the foramen of Monro. The cyst has a central T1 hyperintense focus that represents inspissated proteinaceous debris. Th...