Extrarenal pelvis
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Extrarenal pelvis refers to the presence of the renal pelvis outside the confines of the renal hilum; it is a normal anatomic variant.
Epidemiology
It is found in ~10% of the population 2.
Radiographic features
Ultrasound
An extrarenal pelvis usually appears dilated, erroneously suggesting obstructive pathology. Subsequent investigation with CT usually clarifies a false interpretation on ultrasound.
CT/MRI
- a normal extrarenal pelvis will demonstrate normal renal cortical thickness, bilateral symmetrical contrast excretion and normal appearing calyces 3
Differential diagnosis
- hydronephrosis, from whatever cause
- PUJ obstruction
Practical points
After evaluation with ultrasound and/or CT/MRI, if there is still confusion whether a dilated renal pelvis is obstructed or not, renal scintigraphy can clarify
-<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 <a title="Normal anatomic variants" href="/articles/anatomical-variants">normal anatomic variant</a>.</p><h4>Epidemiology</h4><p>It is found in ~10% of the population <sup>2</sup>. </p><h4><strong>Radiographic features</strong></h4><h5>Ultrasound</h5><p>An extrarenal pelvis usually appears dilated, erroneously suggesting obstructive pathology. Subsequent investigation with CT usually clarifies a false interpretation on ultrasound.</p><p><strong>CT/MRI</strong></p><ul><li>a normal extrarenal pelvis will demonstrate normal renal cortical thickness, bilateral symmetrical contrast excretion and normal appearing calyces <sup>3</sup>- +<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 <a href="/articles/anatomical-variants">normal anatomic variant</a>.</p><h4>Epidemiology</h4><p>It is found in ~10% of the population <sup>2</sup>. </p><h4><strong>Radiographic features</strong></h4><h5>Ultrasound</h5><p>An extrarenal pelvis usually appears dilated, erroneously suggesting obstructive pathology. Subsequent investigation with CT usually clarifies a false interpretation on ultrasound.</p><p><strong>CT/MRI</strong></p><ul><li>a normal extrarenal pelvis will demonstrate normal renal cortical thickness, bilateral symmetrical contrast excretion and normal appearing calyces <sup>3</sup>
-<li><a href="/articles/pelvi-ureteric-junction-obstruction-1">PUJ obstruction</a></li>- +<li><a href="/articles/pelviureteric-junction-obstruction-1">PUJ obstruction</a></li>
Tags changed:
- variants
- cases
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