Fig. 1

Volumetric analysis. Axial MR images obtained in a patient with a right temporal lesion infiltrating the mesial temporal lobe structures. The lesion showed an irregular shape with no enhancement on the postcontrast T1-weighted images, which was revealed an oligoastrocytoma by histopathological findings (a). The tumor was more visible on T2 FLAIR and was segmented manually slice by slice using the “paint effect” in the editor module of 3D slicer (b). Using the “make model effect,” a 3D object was built (c). The tumor volume automatically computed was 42.6 cm³