Hyperparathyroidism
| Feature | Detail |
|---|---|
| Subperiosteal resorption | radial aspect of the middle phalanges of the 2nd and 3rd fingers (earliest, pathognomonic); also medial proximal tibia, femoral neck, lamina dura of teeth |
| Acro‑osteolysis | terminal tuft resorption |
| Subchondral / subligamentous resorption | distal clavicles, SI joints (pseudo‑widening), pubic symphysis, ischial tuberosities |
| Salt‑and‑pepper (pepper‑pot) skull | granular mottled lucency |
| Brown tumours (osteitis fibrosa cystica) | expansile lytic lesions (more in primary HPT); heal with sclerosis |
| Chondrocalcinosis | CPPD (primary HPT) |
| Nephrocalcinosis, nephrolithiasis | primary HPT |