Parotid/Submandibular Gland
Salivary gland ultrasonography is a highly effective, non-invasive imaging method used to evaluate the parotid and submandibular glands. Because these major salivary glands are located superficially in the neck and jaw regions, high-frequency linear transducers provide exceptionally detailed, real-time images of their tissue architecture.
During the procedure, ultrasound waves map the gland's echogenicity—its ability to bounce back sound waves. A normal parotid or submandibular gland typically appears homogeneous and bright (hyperechoic) compared to the surrounding muscle layers.
This imaging technique is primarily used to diagnose and differentiate various salivary pathologies:
- Obstructive Conditions: It can easily detect sialolithiasis (salivary stones) blocking Wharton's duct or Stensen's duct, often showing up as bright white structures casting a dark acoustic shadow behind them.
- Inflammatory Diseases: Conditions like acute sialadenitis or autoimmune disorders (such as Sjögren’s syndrome) alter the gland’s appearance, making it look swollen, patchy, or filled with small fluid pockets.
- Tumors and Masses: Ultrasound helps clinicians differentiate between fluid-filled cysts and solid masses, characterizing benign tumors (like pleomorphic adenomas) or malignant lesions by evaluating their borders and internal blood flow via Color Doppler.
Additionally, ultrasound provides real-time guidance for fine-needle aspiration biopsies (FNAB) if a mass requires tissue sampling. It remains a preferred first-line diagnostic tool because it avoids radiation, requires no patient preparation, and offers excellent visualization of superficial soft tissues.
