In cases of sialolithiasis , ultrasound of the parotid glands is a useful, readily available, noninvasive, and inexpensive option. Multiplanar data acquisition allows for 3D reconstruction. Intravenous contrast material can be administered for better soft tissue evaluation, especially for parotid masses. In the s and s, when this technique was first introduced, slower CT scans called for delayed ductal emptying, for which atropine was given.
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They occur most often in the parotid gland. The growths slowly increase in size, expanding the gland. Preparation for a sialogram You should tell your doctor the following before you have a sialogram: Tell them if you have a contrast or iodine allergy. You may need medication to prevent an allergic reaction during or after the test. In most cases, the test will not interfere with your medication schedule.
No other preparation is typically necessary for a sialogram. How is a sialogram performed? A sialogram is normally an outpatient procedure. It typically takes place in the radiology department of a hospital or clinic. The procedure typically takes about 30 minutes. It may take longer if the duct opening is difficult to locate. Your doctor or an X-ray technician will perform the sialogram.
They may give you a sedative to help you remain calm. No numbing agent is used. The procedure causes only minimal discomfort. This will show if there are any stones that might prevent the contrast material, or dye, from entering the ducts and reaching the gland. They may ask you to hold the tube in place. The technician will inject contrast material into the duct.
You may experience pressure and some discomfort. After the dye fills the salivary gland, it will be visible by X-ray. Your doctor may need to examine your salivary gland from different angles.
You may have to turn your head in different directions. You may also need to hold your breath periodically. This helps you stay still for the X-ray images. They may give you lemon juice to increase the amount of saliva in your mouth. After the sialogram is over, the contrast material will drain into your mouth. They may instruct you to massage your salivary glands.
This will aid in draining the dye. The dye may taste bitter. After your sialogram, you can return to your normal diet and activities. What are the risks of a sialogram? A sialogram will expose you to minimal amounts of radiation.
However, the test can help your doctor learn important information about your health. The risk of radiation exposure is considered acceptable for this reason. Special considerations may be necessary for pregnant women, women who are breast-feeding, and children. These groups have an increased risk of harm from radiation. A sialogram is a minimally invasive technique. However, it carries a small risk of damage or puncture to the salivary duct, swelling, and tenderness.
Infection is a rare complication. Contact your doctor if you experience: soreness or pain that continues after 24 hours swelling or bleeding of the salivary duct a fever.
In the evaluation of the functional integrity of the salivary glands In case of obstructions To evaluate the ductal pattern In case of facial swellings, to rule out salivary gland pathology In case of intra-glandular neoplasms. Cases where there is acute infection, patients with thyroid function tests When calculi are located in anterior part of the salivary gland duct Procedure[ edit ] Contrast agents are classified into two groups: fat-soluble contrast agents and water-soluble contrast agents. Water-soluble contrast agents can fill the finer elements of the ductal system. Fat-soluble contrast agents are viscous and can cause allergic reactions. These can also cause discomfort to the patients. Fat-soluble contrast agents do not fill finer elements of the duct.