Pseudokidney Sign

A term referring to the ultrasonographic appearance of a circumferentially thickened bowel wall which resembles the renal cortex. The dilemma is solved with a CT scan, in which the GI tract demonstrates obvious thickening, caused by primary colon cancer, inflammatory bowel disease, or intussusception—which is also known as the target or bull’s-eye sign
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Moreover, the specific sonographic signs of acute diverticulitis were not detected during the preliminary US examination, and only the pseudokidney sign was reported.
On ultrasonography multiple, concentric, target like appearance of wall layers of invaginated segments (Target sign) on axial scan, as well as pseudokidney sign (sandwich sign) on longitudinal scans were accepted as diagnostic criteria for intussusception.
The ultrasound revealed a targetoid appearance (Figure 1) in the bowel and a pseudokidney sign (Figure 2) consistent with intussusception.
Solid lesions and neoplastic masses can produce a characteristic sonographic pattern, known as the target or pseudokidney sign.
CT will show a pseudokidney sign and a target sign, with edema of Kerckring's folds in the intussusceptum of the small bowel.
Sandwich sign, hayfork sign, pseudokidney sign can be seen on longitudinal scan.