What is the differential diagnosis of acro-osteolysis?

Scleroderma (tips of fingers appear bitten off on radiographs)
Psoriasis (usually accompanied by nail pitting and ridging)
Hyperparathyroidism (usually accompanied by other resorptive changes)
Diabetes
Frostbite
Chronic or repetitive trauma
Raynaud's phenomenon
Polyvinyl chloride poisoning
Hedju-Cheney syndrome