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Non-contrast CT head showed no acute intracranial abnormality. However, there is near complete opacification of the left maxillary sinus with soft tissue extension into the premaxillary and retromaxillary space. There is also subtle abnormal fat stranding in the left superior parapharyngeal and masticator space around the pterygoid muscles. Invasive infectious process was suspected and an urgent MRI sinus with contrast and ENT consult were recommended.