The distribution of bronchi in gross anomalies of the right upper lobe particularly lobes subdivided by the azygos vein and those containing pre-eparterial bronchi.

I. The Lobe of the Azygos Vein Lorus venae azygos, a now commonly recognized malformation of the right upper lobe, was first described in 1777 by Heinrich August Wrisberg, Doctor of Medicine and Director of the Anatomical Institute at Gottingen (25). His “observations,” made on a cadaver of a three-year-old boy, were especially noteworthy in recognizing that the vena azygos of this specimen presented an aberrant configuration on both sides. The original wood cut (see Fig. 1) shows only the right lung, but the description of the vein of the left side leaves no doubt that the left upper lobe was also cleft: “In order that the progress of the left vena azygos towards the subclavian (i.e., the innominate vein) might be rendered easier, the superior lobe of the left lung was provided with a comparable sulcus or rather incisure such as we have described in connection with the right vena azygos.” Although this left-sided anomaly has never been reported again in a dissected specimen, Schmitz-Cliever (22) by emplo...