Typical hypertrophic osteoarthropathy seen as thickened periosteum.
Differential diagnosis of hypertrophic osteoarthropathy
- HPOA (Lung cancer) (symmetrical, usually involves proximal large bones)
- Thyroid acropachy (normally symmetrical and involves distal small bones)
- Pachydermoperiostosis (primary hypertrophic osteoarthropathy, suspect in younger patients, can involve small tubular bones)
– Involvement of epiphysis distinguishes it from secondary form of hypertrophic osteoarthropathy
- Rarely hypervitaminosis A