Citation, DOI & article data
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.
- 1. Panagiotopoulos N, Barnard J, Wells F. The Snoopy sign. (2014) European journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery. 45 (3): 586. doi:10.1093/ejcts/ezt331 - Pubmed
- 2. Abbas AE, Appleton CP, Liu PT, Sweeney JP. Congenital absence of the pericardium: case presentation and review of literature. (2005) International journal of cardiology. 98 (1): 21-5. doi:10.1016/j.ijcard.2003.10.021 - Pubmed
- 3. Sempokuya T, Lum CJ, Veillet-Chowdhury M, Rivera K. A Case Report of Congenitally Absent Pericardium Masquerading as Recurrent Pericarditis. (2019) Hawai'i journal of medicine & public health : a journal of Asia Pacific Medicine & Public Health. 78 (4): 137-140. Pubmed