The phrase "T2 cystic mass" refers to a mass with cystic features that is strongly enhanced on T2 weighted magnetic resonance imaging, or MRI, according to the Radiology Assistant. A cyst is a sac filled with fluid or air, explains Mayo Clinic.
On MRI, a cystic mass has a bright appearance on T2 weighted images. On gadolinium-enhanced images, the center of the cyst is visible as a filling defect because the contrast agent cannot enter the cyst. The rim of the cyst may be enhanced by gadolinium contrast agents, according to the Radiology Assistant.
A basic MRI examination consists of several different types of images. T1 weighted images are primarily used to look at normal anatomy, and T2 weighted images are primarily used to look for disease, according to the University of Bristol.