Thoracic Oncology Network
Ultrasound & Chest Imaging Section
Thoracic ultrasound (TUS) is standard of care for the detection of pleural effusion and guidance of pleural procedures. Recent advancements have further expanded the utility of TUS. TUS has better diagnostic performance than CT scan or chest radiograph for predicting complicated parapneumonic effusion (Svigals PZ, et al. Thorax. 2017;72[1]:94-5). This is likely because of better visualization of septation, but there are still limitations. In a study of 300 pleural ultrasounds, TUS was found to be inadequately reliable in the diagnosis of transudative pleural effusion as 56% of anechoic effusions were exudative, but complex appearing pleural effusion on TUS was found to have high predictive value for the diagnosis of exudative pleural effusion (Shkolnik B, et al. Chest. 2020;158[2]:692-7).
TUS may diagnose nonexpendable lung prior to drainage in malignant pleural effusions. Using M-mode to assess lung motion and speckled tracking for the assessment of lung stain, blunted cardio-phasic response of the lung was highly specific for the diagnosis of nonexpandable lung (Salamonsen MR, et al. Chest. 2014;146[5]:1286-93). TUS can also be used to assess the success of pleurodesis as measured by the adherence score (abolishment of pleural sliding). TUS guided pleurodesis approach was shown to decrease the hospital length of stay in patients undergoing pleurodesis for malignant pleural effusion (Psallidas I, et al. Lancet Respir Med. 2022;10[2]:139-48). Point-of-care TUS is evolving, and adapted use focusing on patient-centered outcomes will further enhance the utility of this indispensable tool.
Amit Chopra, MD, FCCP
Nicholas Villalobos, MD