The radiological findings of the temporal bone in patients with CSOM evaluate the extent and sites of involvement of the middle ear and mastoid air cell
system and study the inter relationships of the tympanomastoid compartment with the adjacent, critical and important neurovascular structures.
The mastoid air cell
system represents a more or less extensive system of interconnecting air filled cavities arising from the walls of the mastoid antrum and walls of the middle ear.
Opponents of mastoidectomy argue that the mastoid air cell
system is thought to function, at least in part, as a buffer to the changes in pressure within the middle ear.
(10.) Holmquist J, Bergstorm B: The mastoid air cell
system in ear surgery, Arch Otolaryngol, 1978, 104: 127-9.
Computed tomography (CT) of the temporal bone showed destruction of the inferior wall of the right EAC by a lesion with a soft-tissue density, but the aeration of the mastoid air cell
and the middle ear space was normal.
INTRODUCTION: The mastoid air cell
system forms an important contribution to the middle ear ventilation and acts as a surgitank of air.
Canaloplasty is sufficient for small lesions that do not involve the mastoid air cell
. Skin grafting is beneficial when there is a large defect.
The development of the mastoid air cell
system begins in utero.
A computed tomography (CT) scan of the head showed thickening of the ear skin; focal tympanal bone osteolysis; partial right mastoid air cells
and middleear cavity opacification; and osteolysis of the occipital, styloid, and mastoid bones consistent with MOE (Appendix Figure, https://wwwnc.cdc.gov/EID/article/25/4/18-0710App1.pdf).
In radical mastoidectomy, the tympanic membrane, the ossicular chain, the posterior wall of the external auditory canal, and the mastoid air cells
were surgically drilled out, leaving an enlarged cavity open to the external canal.
There was right mastoid air cells
opacification and partial opacification of the left sphenoid sinus.
Computed tomography of the temporal bone revealed a right-sided, 2 x 2-cm soft-tissue mass in the EAC, with erosion of mastoid air cells
but a normal eardrum and middle ear cavity.