Fig. 2

MRI findings. a Axial cross section. b Coronal section. As shown in a and b, a tumor measuring 29 × 24 × 40 mm was found exhibiting clear borders between the edges and surrounding tissue. The anterior part of the tumor borders the right submandibular gland, whereas the posterior part was depressing the right internal jugular vein (a). In general, the lesion exhibited high-density signal with a low-density area