Snoopy sign

Last revised by Mostafa El-Feky on 7 Jan 2023

The Snoopy sign is a chest radiographic appearance in pericardial agenesis. It is due to combination of cardiac levoposition (heart shifted to the left), lengthening and flattening of the border of the left ventricle, radiolucency separating the left ventricle and left hemidiaphragm, radiolucency separating the pulmonary artery and aorta, and loss of the right heart border.

History and etymology

The originator of the "Snoopy sign" is not known, however in a paper published in 2005 it is clearly already well-established enough that it is not specifically referenced 2.

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Case 1
    Drag here to reorder.
  • Case 2
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.