_This sign is produced on barium studies due to ulcerative pockets, usually in the terminal ileum, indicative of Crohn's.
Comet Tail Sign
_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%
Corkscrew appearance
It is the angiographic hallmark of Buergers disease, which represents collaterals around areas of occlusion (most often at wrist & ankles) and the absence of atherosclerotic findings.