Soft tissue mass obliterating the left ethmoid cells, destroying the internal bony septa, and extending into the superior portions of the left nasal cavity and obliterating the left fronto ethmoidal recess. It shows to be isointense on T1 and slightly heterogeneously hyperintense on T2, with vivid contrast enhancement having a slightly "cerebriform" pattern. The left frontal sinus is fully filled by homogeneous fluid content, with only a thin smooth rim of mucosal enhancement. Similarly smooth but slightly thicker enhancing tissue abuts the inferior most aspect of the frontal sinus where the bony wall is attenuated. No evidence of invasion into the cranial vault.