Twenty-five percent (3/12) of patients recently operated on for ascending aortic aneurysms secondary to cystic medial necrosis had significant obstruction of the superior vena cava that was corrected by repair of the aneurysm. Roentgenograms are useful in outlining the mechanism of obstruction.
Roberts AJ, Jaffe RB, Michaelis LL, Morrow AG. Cystic Medial NecrosisA Correctable Cause of the Superior Vena Cava Syndrome. Arch Surg. 1974;109(1):84-86. doi:10.1001/archsurg.1974.01360010062015