Presentation
Adult male with chronic renal failure on hemodialysis and secondary hyperparathyroidism.
Patient Data
Age: 40 years
Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.
From the case:
Hyperparathyroidism with erosion of dens
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Coronal bone window

Note the expansile lytic lesion at left side of dens with sclerotic rim. The patient has lytic lesions elsewhere including mandible and skull base (not shown) consistent with hyperparathyroidism.