Erosion of the odontoid peg can result from a number of pathological entities:
- inflammatory arthropathy
- rheumatoid arthritis: classic 1,2
- systemic lupus erythematosus
- crystal arthropathy
- calcium pyrophosphate arthropathy (CPPD): relatively common
- gout
- non-inflammatory arthropathy: osteoarthritis
- infective arthropathy
-
osteomyelitis
- bacterial
- tuberculosis
-
osteomyelitis
- metastases or primary bone tumor: rare
- hyperparathyroidism
- Down syndrome
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