Elastography Versus B-Mode Lung Ultrasound for the Diagnosis of Iatrogenic Pneumothorax: An Observational, Monocentric, Prospective Study.

Background: Thoracic ultrasound (TUS) has emerged as a viable alternative of computed tomography (CT) for pneumothorax diagnosis. Ultrasound elastography (USE), a technique assessing tissue elasticity, has recently been proposed as a novel tool for pneumothorax evaluation. Methods: This prospective, monocentric, observational study aimed to compare the diagnostic accuracy of static and dynamic USE with TUS in detecting iatrogenic pneumothorax after CT-guided transthoracic needle aspiration (TTNA). Results: Thirty-two patients were enrolled, with pneumothorax confirmed via CT in 40.63% of cases. The results showed that elastographic-mode images had significantly higher sensitivity (76.9% vs. 21.2%, p < 0.001) and improved positive and negative predictive values (67.8% vs. 52.4%, p-value 0.01, 82.6% vs. 61.7%, p-value < 0.001, respectively), compared to B-mode images. Concordance between expert and non-expert evaluators was also higher for elastographic images, suggesting improved interpretability. However, dynamic USE did not demonstrate a statistically significant advantage over B-mode videos. Conclusions: These findings suggest that USE may enhance static ultrasound-based pneumothorax detection and provide an objective imaging marker for reports. Further multicenter studies are needed to confirm these findings and explore the potential role of USE in other settings.