Motion artifact partially degrades the exam.
There is total opacification of the left maxillary sinus with partial obliteration of the left nasal cavity. There is partial opacification of the left frontal and left ethmoid sinuses. There is a multiloculated mass-like enhancing STIR hyperintense lesion with marked restricted diffusion in the left maxillofacial region. There is corresponding obliteration of the left perimaxillary and retromaxillary fat. There is transspatial extension into the left masticator and the left parapharyngeal spaces.