Color-coded duplex endoscopic ultrasound of the adrenals

Area of Science:

• Gastroenterology
• Endocrinology
• Medical Imaging

Background:

• Endoscopic ultrasound (EUS) is valuable for adrenal lesion detection and localization.
• Distinguishing adrenal tumors based on endosonographic features alone remains challenging.
• Assessing blood flow patterns may improve differential diagnosis of adrenal lesions.

Purpose of the Study:

• To evaluate the utility of color-coded duplex EUS (CD-EUS) in visualizing and analyzing blood flow in common adrenal lesions.
• To correlate perfusion patterns with histological diagnosis, including adenomas, hyperplasia, and pheochromocytomas.
• To assess the relationship between perfusion and endosonomorphological features like echogenicity, echostructure, and tumor size.

Main Methods:

• Retrospective analysis of CD-EUS data from 38 patients with 46 histologically confirmed adrenal lesions.
• Lesions included adenomas (n=20), nodular hyperplasia (n=11), and pheochromocytomas (n=15).
• Perfusion was semiquantitatively classified as absent, slight, moderate, or high.

Main Results:

• Pheochromocytomas demonstrated significantly higher perfusion compared to adenomas (p=0.003) and nodular hyperplasia (p=0.047).
• No significant association was found between perfusion patterns and lesion localization, echogeneity, echostructure, malignancy, or tumor size.
• CD-EUS successfully visualized varying degrees of hypervascularization in the studied adrenal lesions.

Conclusions:

• CD-EUS is a valuable adjunct tool for endosonographic distinction of adrenal tumors.
• Visualization of hypervascularization via CD-EUS may improve the detection of pheochromocytomas.
• CD-EUS findings should be integrated with clinical, laboratory, and chemical data for comprehensive interpretation due to overlapping perfusion patterns.