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Large kidney with spindled calices:
lymphoma, leukemia, pyelonephritis, acute RA occlusion, acute RVT, acute obstruction
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Normal size kidney with spindled calices:
multiple cysts (parapelvic or peripelvic), renal sinus lipomatosis
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Hypodense rim:
acute cortical necrosis, perinephric lymphoma
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Subcapsular rim sign:
infarct, ATN, RVT
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Extracalyceal contrast: striations �
medullary sponge kidney, early papillary necrosis, pyelosinus or pyelovenous backflow in obstruction, interstitial edema;
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Extracalyceal contrast: focal collections �
late papillary necrosis, calyceal diverticulum, cavity from cyst rupture, abscess
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Dilated calyces/collecting system:
obstruction, papillary necrosis, congenital megacalyces, calyceal diverticulum, reflux
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Bilaterally enlarged kidneys:
ADPKD, lymphoma, glomerulonephritis, HIV, amyloid, bilateral RVT
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Bilaterally small kidneys:
chronic inflammation, bilateral RAS, chronic reflux, ESRD
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Unilateral renal atrophy (smooth):
chronic ischemia (RAS, RVT), postobstructive atrophy, renal hypoplasia, chronic subcapsular hematoma, radiation
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Unilateral renal atrophy (irregular):
reflux nephropathy, analgesic nephropathy, DM
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