Extrarenal pelvis
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Extrarenal pelvis refers to the presence of the renal pelvis outside outside the confines of the renal hilum. It is a normal variant that is found in ~10% of the population 2.
The renal pelvis is formed by all the major calyces. An extarenal pelvis usually appears dilated giving a false indication of an obstructive pathology. Subsequent investigation with CT, usually clarifies the false interpretation on ultrasound.
Radiographic appearancefeatures
CT
- a normal extrarenal pelvis will demonstrate normal renal cortical thickness, bilateral symmetrical contrast excretion and normal appearing calyces3
Differenital diagnosis
- more distensible than anintrarenal (renal) pelvis and thus may be confused for proximalhydroureter or PUJ obstruction
-<p><strong>Extrarenal pelvis</strong> refers to the presence of the renal pelvis outside the confines of the <a href="/articles/renal-hilum">renal hilum</a>. It is a normal variant that is found in ~10% of the population <sup>2</sup>. </p><p>The <a href="/articles/renal-pelvis">renal pelvis</a> is formed by all the major calyces. An extarenal pelvis usually appears dilated giving a false indication of an obstructive pathology. Subsequent investigation with CT, usually clarifies the false interpretation on ultrasound.</p><h4>Radiographic appearance</h4><h5>CT</h5><ul><li>a normal extrarenal pelvis will demonstrate normal renal cortical thickness, bilateral symmetrical contrast excretion and normal appearing calyces <sup>3</sup>-</li></ul><h4>Differenital diagnosis</h4><ul><li>more distensible than an <strong>intrarenal (renal) pelvis</strong> and thus may be confused for proximal <a href="/articles/hydroureter">hydroureter</a> or <a href="/articles/pelviureteric-junction-obstruction">PUJ obstruction</a>- +<p><strong>Extrarenal pelvis</strong> refers to the presence of the renal pelvis outside the confines of the <a href="/articles/renal-hilum">renal hilum</a>. It is a normal variant that is found in ~10% of the population <sup>2</sup>. </p><p>The <a href="/articles/renal-pelvis">renal pelvis</a> is formed by all the major calyces. An extarenal pelvis usually appears dilated giving a false indication of an obstructive pathology. Subsequent investigation with CT, usually clarifies the false interpretation on ultrasound.</p><h4>Radiographic features</h4><h5>CT</h5><ul><li>a normal extrarenal pelvis will demonstrate normal renal cortical thickness, bilateral symmetrical contrast excretion and normal appearing calyces <sup>3</sup>
- +</li></ul><h4>Differenital diagnosis</h4><ul><li>more distensible than an <strong>intrarenal (renal) pelvis</strong> and thus may be confused for proximal <a href="/articles/hydroureter">hydroureter</a> or <a href="/articles/pelvi-ureteric-junction-obstruction-1">PUJ obstruction</a>
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