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An animal study of chimpanzees described epithelial buds from the antrum, visible at 34 weeks, as precursors of the mastoid air cell system.
At this time a repeat CT scan showed extensive abnormality of the left temporal bone and opacification of the left middle ear, external auditory canal and mastoid air cells.
1) that had engulfed the epitympanum with extrusion through the aditus ad antrum into the mastoid air cells.
Computed tomography scan of the temporal bones showed significant diffuse soft tissue swelling along the right aspect of the face and temporal bone with opacification of the middle ear and mastoid air cells on the right.
High-resolution CT of the temporal bones detected a soft-tissue mass in the left EAC; there was no bony destruction, and the middle ear and mastoid air cells were normal (figure 1, B).