Single cavity benign fluid filled cyst in a bone
Aetiology
- Probably a growth defect in the physis and are therefore metaphyseal in long bones (usually in proximal humerus and femur), although they can occur in the talus or calcaneus
Clinical presentation
- May be asymptomatic and an incidental finding (usually x-ray of child/YA) but can weaken the bone leading to pathological fracture
Investigations
- Imaging - x-ray, MRI

Management
- Treatment with curettage and bone grafting +/- stabilisation may be required