To the Editor.
—A number of papers have appeared reporting the use of the Mobin-Uddin umbrella for occlusion of the inferior vena cava in patients with pulmonary emboli. Although the morbidity and mortality of this procedure is extremely low, I would like to report a case in which the inferior vena cava occluding device was placed in the right renal vein, inadvertently, with no compromise of renal function as demonstrated by an intravenous pyelogram six weeks later.
Report of a Case
A 75-year-old white woman, who had undergone a right lumbar sympathectomy and autogenous saphenous vein femoral popliteal bypass for superficial femoral artery obstruction, developed dyspnea one week postoperatively. A lung scan on Aug 4, 1971, revealed changes consistent with multiple pulmonary emboli. Despite heparin sodium anticoagulant therapy, multiple new areas of involvement became apparent. With the patient under local anesthesia and the use of image intensification control, the applicator