SEGMENTAL PROLONGED CORTICAL NEPHROGRAM AS A RESULT OF RADIATION-DAMAGE TO THE KIDNEYS

We present two cases showing bilateral segmental delayed nephrograms s econdary to radiation injury which occurred during radiation therapy f or retroperitoneal adenopathy. The abnormal areas in the affected kidn eys were not devoid of a nephrogram, but rather showed a persistent co rticomedullary separation indicative of slowed perfusion. Linear margi ns not conforming to the normal renal lobular configuration were a con firmatory feature. Radiation injury should be included in the differen tial of both the asymmetric prolonged nephrogram and the ''segmental'' nephrogram.