Table 3 The distinctive imaging findings of CPPD deposition in ligamentum flavum and ossification of ligamentum flavum (OLF) in the cervical spine
CPPD deposition | OLF | |
|---|---|---|
1. Morphology | Nodular | Beaklike or moundlike |
2. Location | C4–5 and C5–6 | No common location |
3. Involvement of level | Multilevel predominant | Single level predominant |
4. Side of the involved ligament | Always bilateral | Unilateral or bilateral |
5. Extend to the posterior facet joints | Absent | Always present |
6. Continuity with the lamina | No continuity | Continuity with lamina |
7. Acute on chronic phenomenon | Depend on symptoms duration | Not reported |
8. Retro-odontoid lesion | May present | Not reported |