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Evidence of frontal and extensive sinus surgery is noted. The right frontal mass, hyperintense on T1, isointense on T2 and post contrast demonstrating no substantial enhancement. A small cystic focus noted posterior to the lesion on T2 imaging. On the left, there is evidence of a prior craniotomy. The frontal pole is distorted and gliotic herniating through a defect in the posterior wall of the frontal sinus. The remainder of the sinus demonstrates high T1 signal consistent with fat.
Findings are consistent with a right sided mucocoele and a left sided encephalocoele.