Diagnostic Ultrasound - Abdomen and Pelvis

Nephrocalcinosis
(Left) Coronal MIP from CT
urogram shows "paintbrush"
appearance ſt of the renal
pyramids consistent with
medullary sponge kidney.
(Right) Longitudinal US of the
right kidney shows echogenic
pyramids with reversal of the
normal corticomedullary
differentiation. Note
medullary ring st of the
hyperechoic rim outlining the
pyramid.
Diagnoses: Urinary Tract
(Left) Longitudinal US of the
left kidney shows echogenic
pyramids st. A shadowing
stone ſt is identified in the
lower pole. Other echogenic
regions represent
additional nonshadowing
calculi. (Right) Axial NECT
through the kidneys shows
multiple calculi within the tips
of bilateral medullary
pyramids ſt. Larger calcium
deposits within renal papillae
and uneven, asymmetric
distribution indicate medullary
sponge kidney as cause of
medullary nephrocalcinosis.
(Left) Longitudinal grayscale
ultrasound shows a transplant
kidney with cortical
nephrocalcinosis related to
cortical necrosis from ischemic
injury after renal vein
thrombosis and subsequent
revascularization. (Right) Axial
NECT through the kidney
shows hyperdense, atrophic
bilateral kidneys with
cortical nephrocalcinosis
related to underlying oxalosis.
Large, dense right renal calculi
ſt are also identified.
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