Comet tail sign (phleboliths)
Citation, DOI, disclosures and article data
At the time the article was created Frank Gaillard had no recorded disclosures.View Frank Gaillard's current disclosures
At the time the article was last revised Mohammadtaghi Niknejad had no financial relationships to ineligible companies to disclose.View Mohammadtaghi Niknejad's current disclosures
The comet tail sign (in urological imaging) helps distinguish a ureteric calculus from a phlebolith and strongly favors the latter.
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.
- 1. Guest AR, Cohan RH, Korobkin M et-al. Assessment of the clinical utility of the rim and comet-tail signs in differentiating ureteral stones from phleboliths. AJR Am J Roentgenol. 2001;177 (6): 1285-91. AJR Am J Roentgenol (full text) - Pubmed citation
- 2. Dyer RB, Chen MY, Zagoria RJ. Classic signs in uroradiology. Radiographics. 2004;24 Suppl 1 (suppl 1): S247-80. Radiographics (full text) - doi:10.1148/rg.24si045509 - Pubmed citation