Tumors of the Kidney
Both benign and malignant tumors occur in the kidney.  With the exception of oncocytoma, the benign tumors rarely cause clinical problems. Malignant tumors, on the other hand,
are of great importance clinically and deserve considerable emphasis. By far the most common of these malignant tumors is renal cell carcinoma, followed by Wilms tumor, which is found
in children and is described in
Figure 20-57Nephrolithiasis. A large stone impacted in the renal pelvis. (Courtesy of Dr. E. Mosher, Brigham and Women's Hospital, Boston, MA.)
Figure 20-58Cytogenetics (blue) and genetics (red) of clear cell versus papillary renal cell carcinoma. (Courtesy of Dr. Keith Ligon, Brigham and Women's Hospital, Boston, MA.)
Figure 20-59Renal cell carcinoma. Typical cross-section of yellowish, spherical neoplasm in one pole of the kidney. Note the tumor in the dilated thrombosed renal vein.
Figure 20-60Renal cell carcinoma. A, Clear cell type, B, Papillary type. Note the papillae and foamy macrophages in the stalk. C, Chromophobe type. (Courtesy of Dr. A. Renshaw,
Brigham and Women's Hospital, Boston, MA.)
Figure 20-61Urothelial carcinoma of the renal pelvis. The pelvis has been opened to expose the nodular irregular neoplasm, just proximal to the ureter.
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