Chronic otomastoiditis should be considered a separate entity from acute otomastoiditis, and is defined as persistent or recurrent inflammation of the middle ear and mastoid, lasting usually for a minimum of 12 weeks, and resulting in permanent perforation of the tympanic membrane.
- conductive hearing loss, pain, otorrhea, vertigo
It is thought to be primarily due to Eustachian tube dysfunction. Interestingly COM is not found in non-human primates. Upright posture and enlarged skull have been postulated as potential predisposing factors.
The term encompasses a number of conditions:
- tympanic membrane changes: thickening, retraction, tympanic membrane perforation or calcification (myringosclerosis)
- mastoid process changes: underdeveloped pneumatization, sclerosis or opacification
- middle ear changes:
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