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Fig. 4. —Interobserver variability in detection of comet-tail sign. CT scan of 46-year-old woman shows small area of soft-tissue attenuation (arrow) immediately posterior to calcification in right hemipelvis. One senior radiologist described this as "probably showing" comet-tail sign and second senior radiologist as "probably not showing" comet-tail sign. Resident noted that comet-tail sign was "definitely absent."