STRATOSHPHERE SIGN /BARCODE SIGN/SEASHORE SIGN

FROM   J Emerg Trauma Shock. 2008 Jan-Jun; 1(1): 19–20.

doi: 10.4103/0974-2700.41788

This M-mode image demonstrates an alternating pattern of
 absent lung sliding with normal lung sliding. This occurs at 
the boundary of the pneumothorax where during inspiration the lung is seen to slide transiently (arrow) and during expiration lung sliding is abolished (arrowhead) This phenomenon, known as the “lung point,” confirms the presence of pneumothorax======








This M-mode image demonstrates a linear, laminar pattern in the tissue superficial to the pleural line (arrow) and a similar linear pattern deep to the pleural line. This phenomenon, known as the “stratosphere sign” or “barcode sign” indicates absent lung sliding and suggests the presence of pneumothorax at this interspace=====




This M-mode image demonstrates a linear, laminar pattern in the tissue superficial to the pleural line (arrow) and a granular or “sandy” appearance deep to the pleural line. This phenomenon, known as the “seashore sign” indicates normal lung sliding and excludes pneumothorax at this interspace==