Soft tissue rim sign (ureteric calculus)

Last revised by Rohit Sharma on 17 Aug 2022

The soft tissue rim sign is used to distinguish a ureteric calculus from a phlebolith. The former appears as a calcific density with a surrounding soft tissue rim, representing the edematous ureteric wall. On the other hand, phleboliths usually have invisible walls (up to 8% may have a soft tissue rim sign 2) but may have a comet tail sign.

This sign may be absent in cases of a larger (>4 mm) and/or ureterovesical calculus 3.

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Cases and figures

  • Case 1: soft tissue rim sign - right
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  • Case 2
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  • Case 3
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  • Case 4
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