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Soft tissue rim sign

Dr Andrew Dixon and Dr Frank Gaillard et al.

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 rim of soft tissue which represents the oedematous ureteric wall. Phleboliths on the other hand usually have imperceptible walls (although up to 8% may have a soft tissue rim sign ²) but may have a comet-tail sign.