Imaging of central neurocytomas.

Central neurocytoma (CN) is an important consideration in the differential diagnosis of any intraventricular lesion. Initial evaluation should include noncontrast CT, MRI with and without gadolinium contrast, and magnetic resonance (MR) spectroscopy, if available. CN classically appear as a partially calcified mass on CT, arising from the septum pellucidum or foramen of Monro, with a soap-bubble multicystic appearance on MR T2-imaging and heterogeneous enhancement on MR T1 postcontrast imaging. MR perfusion/permeability and dynamic contrast imaging are experimental and promising tools in the diagnosis of CN.