Soft Tissue Rim Sign

A CT finding consisting of oedema of the ureter which develops in response to an impacted ureteral stone, which serves to differentiate it from a phlebolith
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Among our study group the frequency expressed as percentages of various secondary signs of ureterolithiasis were hydroureter 25 (83.33 Percent), hydronephrosis of the affected kidney in 23 (76.67 Percent), nephromegaly 16 (53.33 Percent), periureteral edema 19 (63.33 Percent), perinephric stranding 21 (70 Percent), a difference in attenuation between the kidneys 25 (83.33 Percent) while soft tissue rim sign was present in 14 (46.67 Percent) patients.
The soft tissue rim sign is useful in differentiating the ureteric calculi from extra-urinary tract calcifications22.
Another aspect which is mentioned in the previous studies is that soft tissue rim sign requires 4-24 hours to manifest16,24.