CT paranasal sinus is a layered X-ray scan of the paranasal sinuses. Allows you to evaluate the location, structure and thickness of bones, the size and shape of cavities, the patency of nasal passages. It is used to diagnose inflammatory processes, tumors and tumor-like formations, as well as to identify structural anomalies and degenerative changes in the nasal bones and paranasal sinuses. The procedure is non-invasive, unless intravenous administration of a contrast agent is indicated.
The duration of ct paranasal sinus is about 10 minutes. The series of images are deciphered by a radiologist, interpretation takes about 30-60 minutes. The result of the study is presented to the patient in printed form, in addition, it is possible to record on any digital medium (CD-ROM, USB). It is important to understand that the radiologist does not diagnose, but only draws up his expert opinion on the results of CT. The diagnosis is made by an otorhinolaryngologist or another specialist who issued a referral for research.
The procedure is indicated for suspected tumors, polyps and cysts of the paranasal sinuses, gives a clear idea of the structure and boundaries of neoplasia. In some cases, manipulation is carried out with complaints of headaches, the cause of which is not detected in other ways (for example, on an EEG). Indications for the appointment of ct paranasal sinus may be persistent nosebleeds that are not explained by the results of rhinoscopy and other studies. Scanning can be performed for inflammatory diseases of the paranasal sinuses. The technique is used when the standard radiograph is insufficiently informative, as well as when planning surgery on the sinuses.
Contraindications to ct paranasal sinus are divided into absolute and relative. The procedure is absolutely contraindicated during pregnancy. For technical reasons, the use of the technique is impossible in cases where the patient’s weight exceeds the design capabilities of the equipment (120-130 or 200 kg). The list of relative contraindications includes age up to 12 years and lactation period. The study using contrast iodine-containing drugs is not performed with iodine intolerance, severe renal and hepatic insufficiency, diabetes mellitus.
Preparation for CT
Manipulation is carried out in the direction of an otorhinolaryngologist, sometimes a neurologist (for example, with migraines) and other specialists. As a rule, before the procedure, a standard radiography of the sinuses is performed, a CT scan is already assigned based on the results of the image. When conducting a contrast-free study, special training is not required. Contrast scanning is performed on an empty stomach after determining the functional state of the liver and kidneys. Immediately before the tomography, it is necessary to remove all metal objects (hairpins, watches, etc.).