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Scaphoid Cortical Ring Sign
Signet Ring Sign
General Considerations
- The scaphoid cortical ring sign is produced by the foreshortened appearance of the distal pole of the scaphoid rotated on its axis by scapholunate dissociation, one of the manifestations of carpal instability syndromes
- It may, however, be present normally and should be evaluated in light of clinical findings
- Normally, the distance between the scaphoid and the lunate is < 3 mm in the frontal view
- With scapholunate dissociation, this distance increase ( > 3 mm)
- Ulnar deviation will cause an increase in the scapholunate gap
- Radial deviation will close the gap
Radiology Loves Its Ring Signs
Here are 10 More
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| Ring sign |
Ultrasound sign of peripheral nerve tumors |
| Ring sign |
CT sign of epiploic appendagitis |
| Ring sign |
Urographic sign of renal papillary necrosis |
| FLAIR Ring Sign |
MRI
Marker of Dysembryoplastic Neuroepithelial Tumors |
| Incomplete/Open Ring Sign |
MRI sign of demyelinating disease |
| Tubal Ring Sign |
US sign of a tubal ectopic pregnancy |
| Choledochal Ring Sign |
CT sign of acute biliary pancreatitis |
| Signet Ring Sign |
CT sign of bronchiectasis |
| Ring Around the Artery Sign |
CT sign of pneumomediastinum |
| Fat Ring Sign |
CT sign may be seen with mesenteric panniculitis. |
Scaphoid Cortical Ring Sign. When there is rotation of the scaphoid as can occur with scapholunate dissociation (widening of distance between scaphoid and lunate to greater than 3 mm), (yellow arrow), a ring-shaped density can appear as a sign of foreshortening (white arrow).
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