Pseudokidney sign (colonic carcinoma)

Last revised by Rania Adel Anan on 16 Aug 2022

The pseudokidney sign is a non-specific sonographic sign that describes the reniform shape of a mass with a hypoechoic region (representing bowel wall thickening) surrounding a central hyperechoic portion or echogenic stripe (which represents the apposition of the mucosal surfaces) 1,2

It can be occasionally seen in healthy persons; however, detection of this characteristic pattern should raise the suspicion of a bowel lesion 2.

Although it was first described in colonic carcinoma, this sign has been also described in many other gastrointestinal diseases like intussusception (with the mesentery of the intussusceptum appearing as a central hyperechoic region and the entering and returning limbs of the intussusceptum appear as a surrounding hypoechoic region 1), gastrointestinal lymphoma, inflammatory colitis, necrotizing enterocolitismidgut volvulus, and sigmoid volvulus 2.  

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Cases and figures

  • Pseudokidney sign (hepatic flexure)
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