Title: POCUS for hydronephrosis<br/>
Author: Alexis Salerno<br/>
<a href='mailto:alexis.salerno@som.umaryland.edu'>[Click to email author]</a><hr/>
Link: <a href='https://umem.org/educational_pearls/4425/'>https://umem.org/educational_pearls/4425/</a><hr/><p>Ultrasound is the first line diagnostic tool to evaluate younger patients who present to the ED with flank pain. </p>
<p>Most of the time on ultrasound, you will not see the actual kidney stone. More often, you will see associated signs such as hydronephrosis.</p>
<p>In a patient with hydronephrosis, the normally hyperechoic renal pelvis will become anechoic. With increased severity of the hydronephrosis, you can have complete distortion of the kidney. </p>
<p><img src="https://umem.org/files/uploads/content/pearls/hydronephrosis1-65c18700bd83f.jpeg" alt="" /></p>
<p>You can tell the difference between hydronephrosis and a renal vein by placing color doppler over the image. Hydronephrosis will not have flow. </p>
<p><img src="https://umem.org/files/uploads/content/pearls/hydronephrosis_with_color_-_frame_at_0m12s-65c18778c4980.jpeg" alt="" /></p>
<fieldset><legend>References</legend><p>Moore CL, Carpenter CR, Heilbrun ML, et al. Imaging in Suspected Renal Colic: Systematic Review of the Literature and Multispecialty Consensus. J Urol. 2019 Sep;202(3):475-483. doi: 10.1097/JU.0000000000000342.</p>
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