SADAF, A.; RASHID, A.; OMER, S. Pneumopericardium in a child – “halo sign” on chest x-ray: A Case Report. Journal of the Pakistan Medical Association, [S. l.], v. 74, n. 3, p. 580–581, 2024. DOI: 10.47391/JPMA.9393. Disponível em: https://jpma.org.pk/index.php/public_html/article/view/9393. Acesso em: 3 may. 2026.