Left masseter lesion. There is a skin marker overlying the left cheek. There has been increase in size of an enhancing T2 hyperintense focus within the left masseter muscle that measures approximately up to 18 mm, previously 15 mm. The lesion now has a more bulky rather than sheet-like morphology. There is no significant cervical lymphadenopathy. The left parotid gland and other salivary glands are unremarkable. The Waldeyer ring structures are unremarkable. The thyroid gland is unremarkable. The osseous structures are unremarkable. There is a right maxillary sinus retention cyst. The imaged intracranial structures and orbits are unremarkable.
Interval increase in size of a left masseter lesion, which may represent a vascular malformation or tumor versus a mesenchymal neoplasm, for example.