Surgery is planned to excise a hyperfunctioning adrenal adenoma from a patient with primary hyperaldosteronism. On CT scan of the abdomen, the adenoma is visible as a 4-cm mass just superior to the right kidney. In order to immediately relieve the patient’s hyperaldosteronism, the surgeon must first ligate the primary venous drainage of the tumor. The primary venous drainage flows directly into which of the following structures?
(A) Abdominal aorta
(B) Inferior vena cava
© Portal vein
(D) Right gonadal vein
(E) Right renal vein