Needle-based confocal laser endomicroscopy for real-time granuloma detection

Area of Science:

• Medical Imaging
• Gastroenterology
• Pulmonology

Background:

• Needle-based confocal laser endomicroscopy (nCLE) provides real-time microscopic imaging at the needle tip.
• Current nCLE malignancy criteria aid bronchoscopic lung nodule analysis, but criteria for granulomas are absent.
• This study aimed to define and validate nCLE criteria for granulomas.

Purpose of the Study:

• To identify and validate nCLE criteria for granulomas.
• To assess the ability of blinded raters to differentiate between malignant and granulomatous nCLE findings.
• To enhance the diagnostic utility of nCLE in lung nodule analysis.

Main Methods:

• nCLE imaging of mediastinal lymph nodes in suspected sarcoidosis patients during endoscopic ultrasound.
• Identification of nCLE granuloma criteria by correlating imaging with pathology and final diagnoses.
• Validation of nCLE videos by blinded raters for accuracy and reliability in distinguishing granulomas from malignancy.

Main Results:

• nCLE granuloma criteria (brighter-toned, homogeneous, well-demarcated lesions) were identified in 14 sarcoidosis patients.
• Raters achieved 88% accuracy in recognizing granuloma criteria in lymph node nCLE videos, with substantial inter-observer (κ=0.63) and intra-observer (κ=0.70) reliability.
• In lung nodules, nCLE correctly identified granulomas with 92% accuracy and malignancy with 75% accuracy.

Conclusions:

• nCLE enables real-time visualization and identification of granulomas.
• Blinded raters demonstrated high accuracy and consistency in recognizing nCLE granuloma criteria, differentiating them from malignancy.
• nCLE shows significant potential as a real-time tool for guiding lung nodule analysis.