Extrarenal pelvis
Disclosures
- updated 18 Aug 2022:
Nothing to disclose
Updates to Article Attributes
Body
was changed:
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 about 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 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>Radiographic features</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><h5>CT/MRI</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>Differential diagnosis</h4><ul>-<li>-<a href="/articles/hydronephrosis">hydronephrosis</a>, from whatever cause</li>-<li><a href="/articles/pelviureteric-junction-obstruction-1">PUJ obstruction</a></li>- +<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>Radiographic features</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><h5>CT/MRI</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>Differential diagnosis</h4><ul>
- +<li>
- +<a href="/articles/hydronephrosis">hydronephrosis</a>, from whatever cause</li>
- +<li><a href="/articles/pelviureteric-junction-obstruction-1">PUJ obstruction</a></li>
Images Changes:
Image 2 MRI (T2-HASTE long TE) ( create )
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