mastoid air cell


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mastoid air cell

Any of the variable-sized, air-filled sinuses inside the mastoid antrum. About 20% of adult skulls have no mastoid air cells.
See also: cell
References in periodicals archive ?
--Out of the 34 cases with patent auditory tube, 15 cases (44%) had well pneumatized mastoid air cells and 19 cases (56%) had poorly pneumatized mastoid air cell system.
Hollingshead pointed out that the accessory air cells begin to pneumatize after puberty and achieve full size after several years as with mastoid air cells proper.
It is important to evaluate for extension into mastoid air cells, tegmen tympani integrity and facial nerve canal delineation, as these features may change the surgical management.
As noted earlier, opened mastoid air cells and labyrinthine injuries are morbidities associated with the retrosigmoid approach during internal acoustic canal exposure.
Aeration was most commonly to the level of the mastoid air cells in all age groups.
In addition, there was soft-tissue thickening and oedema of the right external auditory canal, fluid in the middle ear and mastoid air cells suggestive of malignant otitis externa.
Surgical exploration identified a large tumor that involved the mastoid air cells from the mastoid antrum all the way up to the stylomastoid foramen.
Posterosuperiorly, there is extension into the mastoid air cells. The left tympanic membrane is retracted.
This can be accompanied by a concomitant shading of the mastoid air cells, which could manifest as a reduced opacity on computed tomography (CT) in the absence of a history of chronic mastoiditis or acute inflammatory signs.
(5) Early diagnosis of the disease process can prevent the dreaded complications of the diseases of the middle ear and mastoid air cells. As the cholesteatoma, middle ear effusion and granulation tissue all share CT numbers ranging from 40 to 60, only secondary findings found in HRCT can differentiate them.
Computed tomography (CT) showed partial opacification of the left mastoid air cells and middle ear cavity and thickening of the left tympanic membrane and skin of the left EAC.
High-resolution CT of the temporal bones detected a soft-tissue mass in the left EAC; there was no bony destruction, and the middle ear and mastoid air cells were normal (figure 1, B).