Concealed drainage of the middle lobe of the lung into the superior vena cava through a tributary of the superior pulmonary vein.
D004322:Drainage; D006801:Humans; D008168:Lung; D011667:Pulmonary Veins / Q000002:abnormalities*; D015619:Respiratory System Abnormalities; D014680:Veins; D014683:Vena Cava, Superior
VEINS, PULMONARY/abnormalities