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There is an aberrant right ICA, which enters the skull base through an enlarged inferior tympanic canaliculus just in front of the jugular bulb. Then courses anteriorly along the cochlear promontory in a typical fashion to join the petrous ICA. There is a relative narrowing as it turns forward in the tympanic canaliculus. The aberrant ICA bulges up into the hypotympanum and abuts /bulges the inferior eardrum outward. It also abuts the malleus insertion.
There is an associated aberrant stapedius artery which enlarges the anterior portion of the (tympanic) facial canal.