On initial investigation at our department, a hemorrhagic granulation-like tumor in the left middle ear cavity
was revealed (Figure 1).
Due to vascularity of the mucosa in the middle ear cavity
and diffusion characteristics of the gas, MEP can be affected by the changes in the tympanomastoid cavity volume.
In preoperative CT scans of the patient, some soft tissue density and aeration loss was observed in mastoid cells, but as our initial diagnosis was chronic otitis media and we did not observe any signs of cholesteatoma in the middle ear cavity
and attic region after clearance of the polypoid mass, we did not explore the mastoid region.
In our series, non-dependent, homogeneous and polypoidal soft tissue densities were present in the mastoid antrum and middle ear cavity
. In some of our cases (n=7), soft tissues occupied all spaces at the time of CT study with antral expansion, abutting the ossicular chain and bulging into the external auditory meatus.
An extensive array of tumors can occur in the middle ear cavity
which can cause CHL by interfering with normal ossicular movement.
[5,6] The hallmarks of the cholesteatoma are the presence of non-dependent soft tissue density in middle ear cavity
, ossicular erosion, smooth erosions of the middle ear borders and adjacent structures.
The coil was attached to the wall of the middle ear cavity
and the magnet was fixed to the long process of the IN.
It seems to minimize static air pressure differences between the ear canal and middle ear cavity
by the passive movement of the membrane toward the side of lower air pressure.
The condition occurs because an infection of the nose or throat passes along the eustachian tube from the back of the nose to the middle ear cavity
. A child's eustachian tube is shorter than those of adults, making it easier for infectious agents to come in contact with the tube and reach the middle ear.
Instead, these animals use a "pressure-gradient system." In humans--and other mammals whose middle ear cavity
is separated from the outside world by bone --sound usually strikes the eardrum from the outside only.
The typical CT findings of cholesteatomas are a soft-tissue mass in the middle ear cavity
with varying levels of destruction [2, 3, 7, 11].
When this soft tissue is present with widening of the middle ear cavity
, aditus ad antrum and loss of it "figure-of-eight" appearance, it increases the likelihood of a diagnosis of cholesteatoma.