CHU-LIN TSAIHSIU-PO WANGWAN-CHING LIENCHIEH-CHANG CHENLai T.-I.WEN-JONE CHEN2022-02-182022-02-1820051472-0205https://www.scopus.com/inward/record.uri?eid=2-s2.0-26944483524&doi=10.1136%2femj.2004.016352&partnerID=40&md5=b97a5a060892b86fb0f60653da769cf4https://scholars.lib.ntu.edu.tw/handle/123456789/594810Ring down artefacts are sometimes found when emergency physicians perform abdominal ultrasound to differentiate between various abdominal problems. We describe a patient who presented with right upper quadrant abdominal pain and whose ultrasound examination showed ring down artefacts posterior to the right hemidiaphragm, which led to the eventual diagnosis of pneumonia. Ring down artefacts on ultrasound may be used to predict pulmonary abnormalities. Awareness of this sonographic finding may assist in accurate diagnosis and administration of appropriate treatment without delay.[SDGs]SDG3antibiotic agent; abdominal disease; abdominal pain; acute cholecystitis; adult; article; artifact; case report; diagnostic accuracy; echography; hemidiaphragm; human; leukocytosis; male; pneumonia; prediction; priority journal; thorax radiography; abdominal pain; artifact; bacterial pneumonia; echography; emergency health service; middle aged; Abdominal Pain; Artifacts; Emergency Service, Hospital; Humans; Male; Middle Aged; Pneumonia, Bacterialjournal article10.1136/emj.2004.016352161890472-s2.0-26944483524