Fig. 1
From: Medullary sponge kidney: unusual finding in kidney transplant recipient
Philips EPIQ, convex transductor, B-mode, frequency 2,5–5 MHz, right lower abdomen quadrant. a The caudal kidney shows a hypoechoic cortical with hyperechoic medulla (arrowheads). The superior calyceal group presents even large kidney stones with the typical rear shadow cone behind (arrows). b The cranial kidney shows the same echographics characteristics of the caudal kidney: a hypoechoic cortical with hyperechoic medulla (arrowheads), and kidney stones with rear shadow cone (arrows). Moreover, we can appreciate the dilatation of renal pelvis probably due to bladder replenish or urethral stones. Renal parenchymal thickness (among calipers) is normal suggesting a preserved renal parenchyma. Both kidneys present the same sonography pattern, consistent with medullary sponge kidney (MSK)