Intraoperatively, a tumor was found to occupy the entire epitympanum and mesotympanum with extension into the hypotympanum
Non-dependent soft tissue component only in 6 15.
Extensive bony destruction in the region of the jugular foramen extending intracranially and into the hypotympanum
of the left middle ear was noted (Fig.
The jugular bulb normally lies below the floor of the hypotympanum
of the middle ear.
Endoscopes of 0, 30, and 45[degrees] were used to identify residual cholesteatoma extending from the posterior mesotympanum into the hypotympanum
The tumor eroded the hypotympanum
and tympanic membrane and extended into external ear.
Follow-up CT angiography showed the asymmetrically enlarged right IJV measuring 25 x 15 mm at its largest dimension and causing erosion of the hypotympanum
Anterior growth is towards the Eustachian tube, inferiorly towards the hypotympanum
and posteriorly towards the handle of the malleus.
Figure 5: NECT Axial section showing a Lobulated soft tissue in hypotympanum
of right middle ear.
Computed tomography (CT) of the temporal bone showed a right middle ear mass on the promontory, biased toward the hypotympanum
OME is primarily caused by inflammation of this epithelium in the Eustachian tube and hypotympanum
The tumor was located primarily in the area of the promontory, but it did not extend to the hypotympanum
, as CT had suggested.