ROENTGEN FEATURES OF RENAL ADENOMAS.

Abstract

Adenomas are common benign tumors of the kidney, occurring as single or multiple yellowish-grey nodules within the renal cortex immediately below the renal capsule. Reports of their incidence at necropsy vary from 0.08 per cent to 3.0 per cent (1, 2). In most instances they are small and incidental findings. The tumors of larger size cause a localized bulge of the renal surface and may also project into the parenchyma to distort the collecting system. Adenomas grow slowly, causing atrophy of the adjacent renal parenchyma which is replaced by connective tissue. This forms a well defined, fairly thick capsule completely surrounding the tumor. Numerous thin-walled venous channels and occasional remnants of renal tissue are encountered within the capsule (Fig. 1). Only a portion of the tumor circumference remains in contiguity with kidney parenchyma; the greater part of the tumor projects into the surrounding perirenal tissues (Fig. 2). Histologically, adenomas are divided into papillary, tubular, and alveola...