What are the caveats? Like its use compared with CT scanning3 and CXR in pneumothorax,4 at the moment, the use of LUS should be seen as complementary to the CXR in community-acquired pneumonia. In smokers or adults >50 years of age, CXR is recommended at follow-up to detect any underlying proximal disease (eg, lung cancer). How does LUS compare with CXR here? UK national guidelines in adults with community-acquired pneumonia still recommend the use of CXR; LUS is not mentioned once in the document.5 Training of ultrasonographers would require at least level two Royal College of Radiology training in chest ultrasound in the United Kingdom to perform and interpret the LUS.6 In addition, acquisition and interpretation of LUS images is notoriously operator dependent, unlike interpretation of CXR (or CT scan). Finally, the CXR may also give useful ancillary information not available from the LUS (eg, mediastinal adenopathy, pulmonary vascular or cardiac disease, underlying lung disease, or metastatic disease).