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The cochlear implant inserted through a posterior tympanostomy through the round window.
The cochlear implant tip is located in quadrant VIII of the cochlea.
When the cochlear implant passes through the left mastoid, it seems to be causing compression on the mastoid portion of the facial nerve against adjacent bone with focal thinning of the facial nerve at this level.
Fluid filling the left mastoid air cells.
Polypoid mucosal thickening in bilateral maxillary and right ethmoid sinuses.
Right-sided nasal septal deviation.