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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Mucosal thickenings noted in bilateral mastoid antrum and remained mastoid air cells.
Mucosal thickenings with CT low dense collections noted in right mastoid antrum and remained mastoid air cells.
Two of our patients had an associated ear infection; one of them (patient 2) had an osteoma in the mastoid antrum and an infection of the middle ear cleft, and the other (patient 6) had an EAC cholesteatoma in addition to her EAC osteoma.
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.
A soft, grayish, well-demarcated mass filled the mastoid antrum, mastoid tip, aditus ad antrum, and epitympanum.
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.