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Notable anastomoses between pulmonary and systemic venous systems are so rare as to deserve mention. In this subject, dissected in the anatomic laboratory of the University of Chicago, a large vein draining the upper two-thirds of the left lung coursed upward and emptied into the vena anonyma sinistra about 1.5 cm. from its beginning at the junction of the vena jugularis interna with the vena subclavia. About 5 cm. from its mouth this vena pulmonalis aberrans gave off a branch which ran posteriorly over the median surface of the lung and emptied into the vena hemiazygos accessoria. On dissecting out the radicals of this unusual vessel it was found that all the blood returning from the upper lobe and the upper half of the lower lobe of the left lung was short-circuited. A relatively small vein from the lower part of the lung entered the left atrium in the normal way.
Patterson J. AN UNUSUAL ANOMALY OF THE LEFT PULMONARY VEIN. JAMA. 1913;61(21):1898. doi:10.1001/jama.1913.04350220042015
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