mastoid antrum


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mastoid antrum

[′ma‚stȯid ′an·trəm]
(anatomy)
An air-filled space between the upper portion of the middle ear and the mastoid cells.
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References in periodicals archive ?
[1] The nondependent soft tissue in middle ear cavity, widening of aditus ad antrum with loss of its "figure of 8" appearance and expansion of the mastoid antrum by soft tissue favours the diagnosis of cholesteatoma.
The osteoma in the mastoid antrum (patient 2) was found during a cortical mastoidectomy to treat an ear infection; in that case, the osteoma had arisen from the medial wall of the aditus.
The mastoid antrum may be the only airfilled space in the mastoid process when the name acellular or sclerotic is applied.
The mastoid antrum is a relatively constant bilateral structure, even in cases of chronic otitis media with sclerotic mastoids.
High-resolution computed tomography (CT) of the temporal bones detected a diffuse soft-tissue lesion in the right middle ear cavity and mastoid antrum (figure 1, A).
With extension into the mastoid antrum, the facial nerve may become involved.
The mastoid antrum was opened via a postauricular approach.
The tumor was encountered in the mastoid antrum adjacent to the incus.
Iatrogenic CSF leaks commonly occur through the cells of the petrous apex to the tympanic cavity or eustachian tube, through the perilabyrinthine cells to the mastoid antrum, through the mastoid air cells at the craniotomy site, or through an opened vestibule and oval window.
CT revealed that the tumor filled the middle ear, extended to the mastoid antrum, and was wrapped around the ossicular chain.
The mastoid antrum was filled with bumpy, yellowish tissue that resembled a cholesterol granuloma.