Abstract
A retrospective analysis of 100 renal sonograms (200 kidneys) was performed to determine how the appearance of the renal pelvis varies in the supine und prone projections. The renal pelvis had no distention in either projection in 100 kidneys. The prone position produced dilatation of a previously normal pelvis with 60 kidneys or increasing dilatation in 6 kidneys. Other changes in the renal pelvis were also identified. We believe this positional change is due to shifting of urine from the normal sized calyces (when supine) to the distensible renal pelvis (when prone). It is possible that elevation of bladder pressure in the prone position may also impede urine flow and produce the observed changes. However, it is important to recognize that the slight dilatation of the renal pelvis does not indicate pathology.
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Berdon WE, Baker DH, Leonidas J (1968) Advantages of prone positioning in gastrointestinal and genitourinary roentgenologic studies in infants and children. AJR 103:444
Riggs W, Hagood JH, Andrews AE (1970) Anatomic changes in the normal urinary tract between supine and prone urograms. Radiology 94:107
Elkin M (1961) The prone position in intravenous urography for study of upper urinary tract. Radiology 76:961
Ellenbogen PH, Scheible W, Talner LB, Leopold GR (1978) Sensitivity of grey-scale ultrasound in detecting urinary tract obstruction. AJR 130:731
Report of the International Reflux Study Committee (1981) Medical versus surgical treatment of primary vesicoureteral reflux: a prospective international reflux study in children. J Urol 125:277
Lee JKT, Baron RL, Melson GL, McClennan BL, Weyman PJ (1981) Can real-time ultrasonography replace static B-scanning in the diagnosis of renal obstruction? Radiology 139:161
Amis E, Cronan JJ, Pfister RC, Yoder IC (1982) Ultrasonic inaccuracies in diagnosing renal obstruction. Urology 19:101
Morin ME, Baker DA (1979) The influence of hydration and bladder distention on the sonographic diagnosis of hydronephrosis. J Clin Ultrasound 7:192
Rosenfield AT, Taylor KJW, Dembner AG, Jacobson P (1979) Ultrasound of the renal sinus: new observations. AJR 133:441
Scola FH, Cronan JJ, Schepps B (1989) Grade 1 hydronephrosis: pulsed doppler US evaluation. Radiology 171:519
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Fernbach, S.K., Bernfield, J.B. Positional variation in the ultrasound appearanace of the renal pelvis. Pediatr Radiol 21, 45–47 (1990). https://doi.org/10.1007/BF02010814
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DOI: https://doi.org/10.1007/BF02010814