The aetiology for<unk>  is not extensively understood. There are several probable factors which could result in the condition appearing, including: *Long term otitis media (or 'glue ear') *Insertion of a tympanostomy tube. If aspiration is performed as part of the insertion, the risk of<unk>  occurring increases. Risk also increases if a larger tube is used, or if the procedure is repeated. *Atherosclerosis *There is ongoing research as to whether or not cholesteatoma is associated with<unk> . If there is an association, it is likely that the two conditions co-exist.
Tympanosclerosis
Vestibular adenitis
Orbital emphysema
Tympanites
Rectovestibular fistula
Surfer's ear
Nasal vestibulitis
Cochlear hydrops