What Is the Mastoid Process?
The angiography is normal, the soft tissue density is uniform, the mastoid height is normal, and the ossicles, bone, and upper tympanum are not damaged.
Mastoid examination
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- Due to its concealed location, complex structure, and high difficulty in projection, CT examination can be used, especially for mastoiditis in the middle ear.
- Name
- Mastoid examination
- category
- Computed tomography computed tomography
- The angiography is normal, the soft tissue density is uniform, the mastoid height is normal, and the ossicles, bone, and upper tympanum are not damaged.
- Abnormal results: The simple type manifests as different degrees of soft tissue density in the middle ear cavity, the mastoid density increases, and the air cells decrease. Bone ulcers are characterized by soft tissue foci in the middle ear cavity with sigmoid sinus and partial skull and auditory ossicle destruction, and the edges of bone destruction are not clear. The cholesteatoma type is characterized by the density of soft tissue in the tympanic cavity, the displacement of the ossicular chain, the expansion of the upper tympanic cavity and the tympanic sinus, and the lateral wall of the tympanic cavity; At the same time, a hardened ring often appears on the edge of the bone destruction cavity. People to be checked: Patients with mastoiditis in the middle ear.
- Unsuitable people: those with allergies or allergies with ionic contrast agents (if using ionic contrast agents, iodine allergy tests are required), infants and children and elderly patients over 60 years old. Contraindications before the examination: (1) Before the examination, the detailed medical history and the results of various examinations must be notified to the CT doctor. If you have X-rays, magnetic resonance films and previous CT films, you must give them to the CT doctor for reference. (2) The clothing to be removed from the inspection site includes underwear with metal substances and various items: headgear, hair clips, earrings, necklaces, jade pendants, coins, belts and keys. (3) For CT enhanced scans or children, unconscious, accompanied by a healthy person. (4) If the contrast-enhanced CT scan uses an ionic contrast agent, an intravenous contrast agent iodine hypersensitivity test is required. After 20 minutes, there is no response before examination. (5) Do not take medicines containing heavy metals for 1 week, and do not perform gastrointestinal barium examination. Patients who have undergone a barium test should wait for the barium to be emptied; those who are anxious for a CT test should give a clean enema or oral laxative to make the barium complete before the CT test. Requirements during the inspection: (1) The inspection process should be performed in accordance with the doctor's password. Do not randomly move to ensure the clarity of the radiography. (2) There is a walkie-talkie on the CT machine. If there is any discomfort or abnormal situation during the inspection, the doctor should be informed immediately.
- (1) Horizontal scanning position and range: cross section, supine position, continuous scan upward with the orbital line to the coronal plane of the tympanic sinus cap, prone position, continuous scan with the coronal line perpendicular to the orbital line from the front edge of the external ear hole, and backward scanning Line: Transverse scan-auditory orbital line (in supine position); Coronal scan-coronal line (in prone position) Layer thickness and layer distance: Ultra thin layer 0.5-2mm; Thin layer 3-5mm. Window width and position: soft tissue window: L30-50HU, window width: W250-300HU Bone window: window position L250-500HU, window width: W1000-1600HU. Other requirements: high resolution algorithm. (2) Enhanced scanning contrast agent: non-ionic iodine-containing contrast agent, 60-100ml for adults, and 2ml / kg for children based on weight. Injection method: Intravenous bolus injection of high-pressure syringe at a rate of 2.0-3.0ml / s. Scan time: 15-18s after the contrast agent is injected. Scanning procedure: The parameters are the same as the plain scan.
- Chronic mastoiditis, mastoiditis, tuberculous middle ear mastoiditis, acute purulent mastoiditis, acute mastoiditis
- Mastoiditis