In cystic cortical tumors involving the temporal lobe, the general differential diagnosis includes DNET, PXA, ganglioglioma. Imaging features, in this case, make DNET more likely.
Dysembryoplastic neuroepithelial tumors (DNET) are usually seen as cortical based tumors in young individuals. It is most often located in the temporal lobe. It appears as a cortical-based "bubbly" appearing mass in the right parietal lobe. The FLAIR image shows a characteristic ring-like hyperintense signal (bright rim sign). No perifocal edema and no contrast enhancement are present.