Adenoid cystic carcinoma of the left floor of mouth. There is an enhancing mass centered the left floor of mouth that measures up to approximately 50 mm. The tumor has eroded into the lingula aspect of the left mandible and extends into the left submandibular space with mass effect upon the glossotonsillar sulcus. The tumor does not extend across the midline. There are denervation changes in the left tongue, but there is no evidence of perineural tumor in the region of the skull base. There is an enlarged left level 1B lymph node that measures 12 x 19 mm in axial section. The right submandibular gland and bilateral parotid glands are unremarkable. There is a right palatine tonsillary crypt retention cyst. The thyroid gland in unremarkable. The imaged orbits and intracranial structures are unremarkable. There is mucosal thickening in the bilateral ethmoid and maxillary sinuses. There is multilevel degenerative cervical spondylosis.
1. The adenoid cystic carcinoma of the left floor of mouth measures up to approximately 50 mm and has eroded into the lingula aspect of the left mandible and extends into the left submandibular space. 2. An enlarged left level 1B lymph node may represent metastatic disease. 