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There is an expansile soft tissue mass whose epicentre lies within the left maxillary sinus. There is associated bony thinning and destruction of the anterior and medial sinus walls. It demonstrates a discreet thin peripheral hyperdense rim which may represent calcification. There are also ill-defined hyperdense peripheral nodules. There is destruction of the adjacent superior alveolar process of the maxilla, with deviation of the premolars, but no impacted tooth identified.
The visualised brain defines normally. The foramina of the skull base are symmetrical. The left inferior orbital wall and boundaries of the pterygopalatine fossa are intact. The rest of the sinuses aerate normally. The masticator, carotid, parotid, pharyngeal mucosal and parapharyngeal spaces are symmetrical.
The expansile left maxillary sinus mass is concerning for a neoplastic process. Involvement of the superior alveolar process raises the possibility of a primary odentogenic mass such as ameloblastoma. A giant cell tumour is also a differential.