But this is rare as pus in the middle ear can drain out easily through a hole in the eardrum or into the mastoid part
of the temporal bone.
In mastoidectomy the surgeon drills through the mastoid part
of the temporal bone (Figure 1) and removes spongiform bone to gain access and to remove inflammatory tissue from the mastoid and middle ear.
Denia et al reported that extracanalicular osteomas of temporal bone most commonly originate from the mastoid part
.4 In our case, osteoma originates from the left petrous bone.
Computed tomography showed extensive destruction of the tympanic and mastoid part
of the temporal bone, as well as lytic lesions in the skull.
These findings are suggestive of facial nerve involvement in mastoid part
. There were no other cranial nerve palsies.