History of allergic fungal sinusitis: nasal congestion. Sinus: There are postoperative findings related to osteoplastic flap surgery with resorption of the flap margins, which is more conspicuous on CT. There is extensive diffuse paranasal sinus mucosal thickening and intraluminal material that predominant displays mildly low T1 and very low T2 signal. In addition, there is expansion of the left frontal lobe with dehiscence of the posterior wall and mild mass effect upon the underlying left frontal lobe. There are also polypoid lesions within the nasal cavity.Brain: Aside from the mild mass effect upon the left frontal lobe, the brain parenchyma otherwise appears unremarkable. There is no evidence of intracranial hemorrhage or acute infarct. There is no abnormal intracranial enhancement. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits appear unremarkable.
Findings suggestive of sinonasal polyposis with what may represent superimposed allergic fungal sinusitis and apparent mucocele formation in the left frontal sinus, but no evidence of intracranial abscess or acute infarction.