FIGURE 12.

Parotid adenocarcinoma (T) of superficial and profound lobes, extending in the area of facial nerve distribution; the patient presented with the right peripheral facial palsy. Axial T2-weighted image (B) shows right stylomastoid foramen fat effacement (dashed arrow) versus the left side (ellipse). Coronal contrast-enhanced T1-weighted images (A, C) reveal retrograde PNS along the mastoid segment of the right CN VII that shows CE (arrowhead). Dynamic contrast enhancement sequence (D) demonstrates possible upper involvement of the CN VII as there appears asymmetric CE of the right tympanic segment (arrow) when compared to the left side (double arrow).