What Does Heterogeneous Opacification In The Left Posterior Ethmoid Air Cells And A Possible Defect With Herniated Intracranial Contents Mean?

Ct scans and MRI state that there is heterogeneous opacification within the left posterior ethmoid air cells. There is a possible overlying defect in the fovea ethmoidalis with the suggestion of herniated intracranial contents through the defect into the opacified ethmoid air cells. What does this mean