The vanishing azygos lobe.
Hall
Ferris M
FM
D001401:Azygos Vein / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D006801:Humans; D008168:Lung / Q000033:anatomy & histology*; D011859:Radiography; D015619:Respiratory System Abnormalities / Q000000981:diagnostic imaging*; D009626:Terminology as Topic