Salivary Gland Scan or Radionuclide Sialography is a non-invasive nuclear medicine exam of the major salivary glands, mostly the parotid and submandibular glands.

This scan, unlike traditional imaging technology, concentrates on the quality of glands in producing and clearing saliva and is therefore very useful when diagnosing functional disorders.

The test has a radiotracer, which is a 99mTc-pertechnetate, that is absorbed by the salivary glands and which is then deposited into the oral cavity. Through this process, as it happens, the doctors can determine the functioning of the glands, ductal blockage, and dynamic salivary flow.

Why is a Salivary Gland Scan Performed?

This scan is advised in cases where the patients have signs of dysfunction in the salivary glands, and in case structural images (such as ultrasound or CT) are inconclusive.

Common Indications:

• Dry mouth (xerostomia) or a low amount of saliva.
• Salivary duct obstruction suspected, but no visible stones or tumors.
• Post-operative or radiation therapy evaluation.
• Sjogren syndrome and chronic inflammatory diseases.
• Identification of abnormality of the glands (aplasia/hypoplasia) at birth.
• Post-operative salivary stones (sialolithiasis) Prophylaxis.
• Pretreatment examination and analysis before radionuclide therapies (e.g., 177Lu-PSMA therapy)
• Distinguishing between obstructive and inflammatory conditions.

How Does the Salivary Gland Scan Work?

This scan operates on the tendency of the salivary glands to absorb and give away certain substances that are natural.

Procedure Steps:

1. Patient Preparation

• There should not typically be any fasting (or slight fasting as recommended).
• Head and neck: Clear metallic objects.

2. Radiotracer Injection

• A small dosage of 99mTc-pertechnetate is injected intravenously.

3. Uptake Phase Imaging

• Immediate imaging to observe tracer absorption by glands

4. Salivary Stimulation Phase

• Lemon juice or a citrus tablet is administered to help in encouraging glandular output.

5. Excretion Phase Imaging

• More pictures are made to determine secretion into the mouth.

Total Duration: Approximately 30–45 minutes

What Does the Scan Evaluate?

The scan gives an active map of the gland activities of the salivary glands, useful in evaluating:

• Tracer uptake by each gland
• Post-stimulus efficiency of salivation.
• Ductal obstruction is present.
• Asymmetry in glands (differences in glands).
• A functioning level before therapies.

Clinical Value of Salivary Gland Scan

This is a useful test, particularly when an anatomical imaging is inconclusive, and one needs to have a functional assessment.

Key Benefits:

• Safe, less uncomfortable, and non-invasive.
• Early functional fMRI changes are detected before structural injury.
• Offers real-time dynamic images.
• Distinguishes between inflammatory, destructive, and neoplastic diseases.
• Handy in treatment planning and quick.
• Enhances the avoidance of iodinated contrast in conventional sialography

Who Should Consider This Scan?

• Patients who have dry mouth or a lack of saliva.
• Patients who have repeated swollen salivary glands.
• Bang theory: suspected ductal blockage of unobservable etiology.
• Patients receiving or intending to receive radiation.
• Gland analysis in the post-operative period.
• Suspected congenital gland problem in children/adults.

Limitations of the Scan

Although quite effective as a functional assessment tool, there are a few drawbacks to the scan:

• Reduced spatial resolution compared to CT or MRI.
• Lack of capability to easily identify small tumors or abscesses.
• It is not the best choice with regard to detailed duct anatomy.
• May also test negative when both glands are affected equally.

Preparation and Safety

• Fasting: Not obligatory (or slight, recommended)
• Indeed, secure but with low radiation.
• Pregnant or Breastfeeding, then inform your doctor.
• No recovery period is required; normal operations can be reinstated right away.

Why Choose Molecular Diagnostics and Therapy?

• The new technology of gamma cameras is advanced.
• Qualified nuclear medicine experts.
• Correct and assuring functional diagnostics.
• Illegal care with stringent safety measures.
• Fast and effective reporting.

Conclusion

Salivary Gland scan (Radionuclide Sialography) is a very effective and valid diagnostic tool that is used to assess the functioning of the salivary glands. It has an important role in detecting functional disorders, ductal obstruction, and inflammatory disorders, particularly in cases of inconclusive results of other imaging procedures.

Its non-invasiveness, real-time functional characteristics, and potential in treatment planning, such as before treatments such as Lu-177 PSMA, make it an inseparable component of contemporary medical diagnostic treatment.

Test Information

• Fasting: 2 hours
• Reporting Time: Within 2–24 hours*