the combination of three or more of the sonographic findings ( increased renal volume 30 % over the baseline value ; enlarged , broadened , rectangular medullary pyramids [ rays ] ; a reduction or absence of the central sinus echoes , and altered echogenicity in the renal parenchyma ) indicated rejection with 97 % specificity and 58 % sensitivity .
C0022646
renal
C0227629
medullary pyramids