Comet sign

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[edit] Discussion of Comet sign

Comet
  • The comet sign has been used at CT to aid in the differentiation of a phlebolith from a stone in the ureter.
  • The calcified phlebolith represents the comet nucleus and the adjacent, tapering, noncalcified portion of the vein is the comet tail.
  • The reliability of the comet sign is not as great as that for the soft-tissue rim sign

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Patient #1

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