ABC

1. Giant cell tumour

Often present with a painful swollen area, lytic on X-ray

- calcaneus > talus

- rare in skeletally immature

- curettage and grafting

- local recurrence ~50 %

- may need to bone graft defects

2. Osteochondromas

Can occur in foot and ankle

- single or multiple

- simple excision at base

- malignant transformation very rare in foot

Subungal exostosis 

Definition

Expansile pseudotumor of reactive hemorrhagic tissue arising in bone

- characterised by blood filled spaces separated by fibrous tissue

Types

Primary 50%

- arise de novo 

Secondary 50%

- in association with other tumours 

- probably secondary to haemorrhage into 1° tumour

- GCT / chondroblastoma / osteoblastoma / osteosarcoma