Is sonoelastography a helpful method for evaluation of parotid tumors?

Area of Science:

• Medical Imaging
• Diagnostic Ultrasound
• Oncology

Background:

• Parotid tumors require reliable diagnostic methods.
• Conventional ultrasonography (US) has limitations in differentiating parotid lesions.
• Sonoelastography (ES) offers a noninvasive assessment of tissue elasticity.

Purpose of the Study:

• To evaluate the effectiveness of combining conventional US with sonoelastography for parotid tumor assessment.
• To determine if sonoelastography improves the reliability of differentiating benign from malignant parotid tumors.

Main Methods:

• A prospective study involving 43 patients with parotid tumors and 54 healthy volunteers.
• High-resolution grayscale ultrasonography (US) and sonoelastography (ES) were performed preoperatively.
• Elastograms were scored using the Ueno 5-point scale (ES1-ES5), and stiffness values (kPa) were recorded.

Main Results:

• Significant differences in tissue stiffness were observed between normal parotid tissue, benign tumors, and malignant tumors (p < 0.001).
• Malignant tumors exhibited higher mean stiffness (146.6 kPa, mostly ES4) compared to benign tumors (88.7 kPa, mostly ES2 and ES3).
• High stiffness scores (ES3,4) were found in 8 malignancies and 18 benign tumors, indicating overlap but potential for differentiation.

Conclusions:

• Combining ultrasonography with sonoelastography enhances parotid tumor evaluation.
• Higher lesion stiffness, particularly ES4, is indicative of malignancy, improving differential diagnosis.
• While promising, the inherent uncertainty of sonoelastography in parotid tumor assessment must be acknowledged.