Diffuse infiltrative lesion in the left neck spanning the posterior aspect of the parotid gland, both superficial and deep lobes, carotid space and posterior cervical space/paravertebral region.
T1 hypointense, T2 mildly hyperintense with fairly uniform moderate enhancement.
It virtually encases the styloid process and surrounds the posterior belly of digastric extending superiorly to fill the stylomastoid foramen and to the undersurface of the occipitomastoid suture. The internal jugular vein is encased and completely compressed. The mass contacts the internal carotid artery around half of its circumference at the level of the soft palate where the ICA lies medially.
It extends close to the vertebral artery just below the left transverse foramen of the atlas but does not directly contact the vessel. There is no definite pathological intracranial facial nerve enhancement.