Ureteropelvic junction obstruction assoc
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Johnson, J. Fred
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Article
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1999
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John Wiley and Sons
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English
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An extrarenal pelvis is associated with the absence of central sinus echoes on sonography. However, central sinus echoes are normally inapparent in some newborns. Furthermore, true absence of a central sinus may cause calices to simulate normal renal pyramids so that the kidney appears normal in a f