The middle ear cleft (tympanic cavity) is the air-filled space within the petrous temporal bone between the tympanic membrane laterally and the oval and round windows medially. It contains the three ossicles (malleus, incus, stapes) and is lined by respiratory epithelium. The Eustachian tube connects it to the nasopharynx anteriorly for pressure equalisation and mucociliary clearance. The mastoid antrum and mastoid air cells communicate posterosuperiorly via the aditus ad antrum.
The middle ear cleft is the site of otitis media (the most common childhood infection), cholesteatoma (keratinising squamous epithelium invading the middle ear and mastoid), and ossicular chain pathology (otosclerosis, trauma, chronic infection). Myringotomy and grommet insertion equalise pressure in secretory otitis media. Tympanoplasty repairs the tympanic membrane. Mastoidectomy removes disease from the mastoid air cell system communicating with the middle ear. The facial nerve (CN VII) passes through the middle ear in its tympanic segment above the oval window, making it at risk in middle ear and mastoid surgery.
Retraction pocket cholesteatoma from the pars flaccida erodes the ossicles and adjacent middle ear walls as it expands within the middle ear cleft, producing conductive hearing loss and potentially lateral semicircular canal fistula or facial nerve erosion; modified radical mastoidectomy removes the disease while cortical mastoidectomy with canal wall-up preserves more anatomy for hearing reconstruction.
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