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Comet tail sign: Urology

Comet-tail sign (in urological imaging) is helpful in distinguishing a ureteric calculus from a phlebolith, and strongly favours the later. 

The sign refers to a tail of soft tissue extending from a calcification, representing the collapsed/scarred/thrombosed parent vein. When well seen it is said to have a positive predictive value of 100% 1

See also

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