Vessels
Aortic nipple
Maximal diameter
<4.5 mm
Radiography (Posteroanterior)
The left superior intercostal vein (aortic nipple) should be less than 4.5 cm on plain film, otherwise further investigation is recommended.
Reference
Shields TW, LoCicero J, M.D. CE et-al. General Thoracic Surgery: Pt. 1. The lung, pleura, diaphragm, and chest wall. Sect. I. Anatomy of the chest wall and lungs. 1. Anatomy of the thorax. Lippincott Williams & Wilkins. (2009).
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