TY - JOUR T1 - Ring down artefacts on abdominal sonography to predict pulmonary abnormalities in the emergency department JF - Emergency Medicine Journal JO - Emerg Med J SP - 747 LP - 748 DO - 10.1136/emj.2004.016352 VL - 22 IS - 10 AU - C-L Tsai AU - H-P Wang AU - W-C Lien AU - C-C Chen AU - T-I Lai AU - W-J Chen Y1 - 2005/10/01 UR - http://emj.bmj.com/content/22/10/747.abstract N2 - Ring 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. ER -