From the case:
Dens erosion - possible CPPD
{"current_user":null,"step_through_annotations":true,"access":{"can_edit":false,"can_download":true,"can_toggle_annotations":true,"can_feature":false,"can_examine_pipeline_reports":false,"can_pin":false},"extraPropsURL":"/studies/6325/annotated_viewer_json?lang=us"}
Erosion of the odontoid peg
From the case:
Dens erosion - possible CPPD
{"current_user":null,"step_through_annotations":true,"access":{"can_edit":false,"can_download":true,"can_toggle_annotations":true,"can_feature":false,"can_examine_pipeline_reports":false,"can_pin":false},"extraPropsURL":"/studies/6326/annotated_viewer_json?lang=us"}
Erosion of the odontoid peg in a patient without inflammatory arthritis or gout most likely represents CPPD.
Case Discussion
Erosion of the odontoid peg can result from a number of causes:
- inflammatory arthropathy
- 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