Inferior vena caval occlusion: characteristic radiographic changes on excretory urography and barium enema examination Madayag, M.A.; Seliger, G. Ajr. American Journal of Roentgenology 128(1): 39-42 1977 0361-803X 10.2214/ajr.128.1.39 https://eurekamag.com/research/026/797/026797325.php