Fig. 2.

Axial T1-weighted magnetic resonance imaging (MRI) demonstrates a lesion located in the roof and posterior as well as posterolateral walls of the right side of the nasopharyngeal cavity and the clivus exhibiting hypointense signal characteristics (a, white arrow). On axial T2-weighted MRI, the lesion displays intermediate signal intensity (b, white arrow). Following intravenous administration of a gadolinium-based contrast agent, axial T1-weighted MRI reveals fairly homogeneous enhancement of the lesion (c, white arrow). The lesion measures approximately 50 mm in its maximal axial dimension and 28 mm in the orthogonal axial dimension, with a craniocaudal extent of 29 mm. There is no significant associated vasogenic edema identified on the axial Fluid-Attenuated Inversion Recovery (FLAIR) sequence (d). Axial Diffusion-Weighted Imaging (DWI) does not reveal restricted diffusion, as evidenced by the absence of hyperintensity (e). Axial Gradient Echo (GRE) sequence does not demonstrate evidence of calcification or intratumoral hemorrhage, as indicated by the absence of susceptibility artifact (f).