We report two cases of supratentorial gangliocytomas mimicking an extra-axi
al tumor. MR imaging indicated that the tumors were extra-axial, and mening
iomas were thus initially diagnosed. Relative to gray matter, the tumors we
re hypointense on T1-weighted images and hyperintense on T2-weighted images
. On contrast-enhanced T1-weighted images, homogeneous enhancement was obse
rved, while CT scanning revealed calcification in one of the two cases.