This case demonstrates a small cortical lesion that is a real challenging for radiologists, even with all the MRI advanced sequences available. The histology confirmed a diffuse glioma most likely representing an oligodendroglioma (WHO grade II). 

Typical MRI features for this kind of tumor were not present, and the appearance was indistinguishable from a cortical dysplasia. 

Note: This case predates the recent (2016) revision WHO classification of CNS tumors, and thus molecular markers (IDH mutation and 1p19q co-deletion) are not available. As such, this tumor would now be classified as an oligodendroglioma NOS.