Figure 4c. Naso-orbital frontoethmoidal encephalocele in a 2-year-old patient. (a) Three-dimensional shaded-surface-display image from CT data shows a large, left-sided fronto-orbital mass. (b) Axial CT scan shows a left frontal lobe encephalocele that extends through the ethmoid bone into the orbit. (c) Axial T2-weighted MR image obtained at the same level as b helps confirm the presence of a frontal lobe encephalocele. The contents of the orbital vault were formed normally.