Renal manifestations of extrarenal neoplasms.

In a study of 1270 consecutive autopsies there were 314 patients with malignant neoplasms arising in sites other than the kidney and central nervous system. In over 50 per cent of these there was significant renal damage related to cancer. Renal damage was produced by direct involvement of one or both kidneys by the neoplasm or by indirect effects. The latter included ischemic damage, metabolic injury, immunologic injury, and effects of therapy directed at the malignant tumor. In patients with cancer, tumor bulk and invasion of vital organs do not always explain the clinical deterioration and cause of death. Recognition of the indirect effects of tumors on the kidney and other organ systems is essential to the understanding of the generalized host response to malignant disease.