Fig 1. Imaging findings at initial imaging. A, Gadolinium-enhanced T1-weighted MR imaging demonstrates an enhanced mass lesion with a large cyst in the right frontal lobe. B, MET-PET image demonstrates intense high uptake of MET in the anterior right frontal lobe (tumor area A: short arrow), moderate uptake of MET in the anteromedial right frontal lobe (tumor area B: long arrow), and intense uptake of MET in the posteromedial right frontal lobe (tumor area C: arrowhead). C, MET-PET image coregistered with gadolinium-enhanced MR imaging. On coregistered images, tumor area B was intensively enhanced with gadolinium (long arrow), but tumor areas A and C had no gadolinium enhancement (short arrow and arrowhead, respectively). D, CT scans demonstrate a cystic right frontal mass with calcification. Tumor area C almost completely corresponded with the calcified lesion.