Fig. 10

Parotid carcinoma. A 63-year-old female with facial paralysis on the left side. There is a lobulated hypointense lesion in the left parotid gland (arrow) on the T1-w axial image (A). The lesion shows some central hypointensity on T2-w imaging (B) with heterogeneous enhancement after administration of contrast (C). There is diffusion restriction of the tumor periphery (D, E). The coronal 3D MPR image after contrast administration (F) shows the asymmetrical thickening and enhancement of the facial nerve due to perineural tumor spread on the left (larger arrowhead) compared to the normal diameter of the right facial nerve (smaller arrowhead). Note also the enhancing tissue around the stylomastoid fossa (arrow)