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Mucoperiosteal thickening seen involving the left frontal, maxillary, ethmoidal and sphenoid sinuses which exhibits intermediate T1 and low T2 signal intensity, avid enhancement after contrast administration and with intraorbital infiltration at the medial side of left orbit and intracranial invasion via the cribriform plate. The left gyrus rectus shows a focal area of abnormal signal surrounded by edema and enhances after contrast administration.