Radiographic evaluation of the skull base

The anatomic complexities of the skull base and the variable clinical presentation of skull base tumors often precludes accurate determination of tumor boundaries by history and physical alone. Imaging, employing computed tomography (CT) and magnetic resonance imaging (MR) allows for accurate tumor mapping and planning of appropriate therapeutic intervention. Calvarium floor involvement and extracranial lesions are well delineated by CT. While multiplanar MR is unparalleled in demonstrating tumor boundaries and extension through the skull base. In order to employ these imaging modalities in an efficient way, it is important to understand the limitations and capabilities of these modalities as well as the imaging characteristics of common skull base lesions.