Catheterization of the adrenal veins is potentially a useful clinical tool since it permits not only detailed visualization of the inner glandular vasculature but also sampling of effluent hormones. Bucht (1) , was the first investigator to study the left adrenal vein angiographically in man; since that time there have been surprisingly few subsequent articles (2, 3) on this subject. We have developed a technic for catheterizing with facility both adrenal veins in man. On the basis of three years experience, we now feel that adrenal phlebography does indeed have wide clinical application. Anatomy The intraglandular venous circulation is complex and incompletely understood (4, 5). The cortex and medulla are drained in series by sinusoids, venules, and muscular veins which join to form the central vein. This then becomes the adrenal vein as it exits on the ventral groove of the gland. It should be noted that the main venous branches are cuffed by invaginated folds of cortex and that even the central vein is...