Sonographic features of ATN and of acute rejection in renal allografts.

The sonographic changes occurring during post transplant acute tubular necrosis and rejection are discussed. Seven patients with proven ATN are shown to maintain normal sonographic features and exhibit normal hypertrophy. In contrast during acute rejection the findings in 21 patients included in order of frequency the following 1) sudden increase in renal volume, 2) prominent medullary pyramids, 3) abnormal echogenicity, 4) decreased amplitude of the central sinus echoes, 5) increased cortical thickness, 6) crescent shaped fluid collections and 7) indistinct corticomedullary boundary.