—Deming1 reported a study to determine the freedom of incisions about the pelvis and the relative significance of the adjacent vessels which might be cut or ligated accidentally or purposely. He observed that following elongation of the pyelotomy incision straight on to the kidney and to the lower pole the renal circulation is not impaired if the retropelvic vessels are conserved. Angulated incisions cause definite shrinkage of the kidney. The incision of choice is the elongated incision to the lower pole near the median line. The suture of the wound in the kidney should not include any of the larger vessels. Ligation of the retropelvic vessels causes considerable renal injury which is not easily repaired in a few months' time.
—Martin2 stated that tumors of the kidney fall into three groups, the chief of which consists of growths arising in the renal epithelium. Tumors