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 .
C0022646
renal
C0227629
medullary pyramids