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Case of the Week 384 
What sign is depicted on this image?
- 51 year-old with wrist pain
Frontal radiograph of the wrist
1. Pronator quadratus sign
2. Triangular lunate sign
3. Ring sign
4. Carpal fusion sign
5. Target sign
Additional Images - None
Additional Images
.
None
Answer:
.
3. Ring Sign
.
.
More (Click Discussion Tab)
Scaphoid Cortical 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
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is an award-winning educational website aimed primarily at medical students and radiology residents-in-training, containing lectures, handouts, images, Cases of the Week, archives of cases, quizzes, flashcards of differential diagnoses and “most commons” lists, primarily in the areas of chest, GI, GU cardiac, bone and neuroradiology. |
