The convex supradiaphragmatic inferior vena cava.
D000328:Adult; D002318:Cardiovascular Diseases / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008223:Lymphoma / Q000000981:diagnostic imaging*; D011859:Radiography; D014682:Vena Cava, Inferior / Q000000981:diagnostic imaging*