Evaluation of lymph node perfusion using continuous mode harmonic ultrasonography with a second-generation contrast...

Area of Science:

• Medical Imaging
• Diagnostic Ultrasound
• Oncology

Background:

• Superficial lymphadenopathies require accurate characterization to differentiate benign from malignant conditions.
• Conventional ultrasonographic techniques (B-mode, power Doppler) have limitations in differentiating lymph node pathologies.

Purpose of the Study:

• To evaluate the diagnostic contribution of continuous mode contrast-enhanced harmonic ultrasonography (CE-HUS) for superficial lymphadenopathies.
• To compare the accuracy of CE-HUS with conventional ultrasonographic methods.

Main Methods:

• Fifty-six lymph nodes from 45 patients were assessed using both conventional ultrasound and CE-HUS.
• Evaluation included dimensions, architecture, margins, and vessel location, followed by CE-HUS assessment of echogenicity enhancement.
• Diagnoses were confirmed via fine-needle aspiration cytology, surgical biopsy, or both.

Main Results:

• CE-HUS demonstrated high accuracy (92.8%) in differentiating benign and malignant lymph nodes, significantly outperforming conventional techniques (78%).
• Specific enhancement patterns were observed: homogeneous enhancement in benign nodes, perfusion defects in neoplastic nodes, and speckled enhancement in lymphomas.
• CE-HUS achieved 93% specificity and 92% sensitivity, a significant improvement over conventional methods.

Conclusions:

• CE-HUS offers a highly accurate method for characterizing superficial lymph nodes as neoplastic or benign based on perfusion patterns.
• This advanced ultrasonographic technique provides superior diagnostic accuracy compared to existing methods for lymphadenopathy assessment.