Nonenhancing hypovascular extraventricular neurocytoma.

Neurocytoma We read with interest the case report by Yang et al. This was a nice presentation of 3 cases with extraventricular neurocytoma, which is a relatively rare tumor. The authors presented clinical, histopathologic, and immunohistochemical findings, along with the imaging characteristics. All tumors in their report showed marked enhancement. They concluded that this entity should be considered in the differential diagnosis of a large parenchymal mass with cystic necrosis, calcification, and/or hemorrhagic foci and extensive enhancement. However, extraventricular neurocytomas may be completely nonenhancing. In an extraventricular neurocytoma case we presented with CT perfusion findings, the tumor was nonenhancing and hypovascular. This was the first presentation of an extraventricular neurocytoma with perfusion findings, as well. Considering our case, we think that marked enhancement is not always necessary for extraventricular neurocytomas. Due to this imaging feature and the histologic similarity, dysembryoplastic neuroepithelial tumor should also be in the differential list of extraventricular neurocytomas.