localised

PVNS

Pigmented Villo-Nodular Synovitis

- benign inflammatory process that arises in synovial tissues

- contains significant amounts of hemosiderin

Age: 20 - 50

Sex: M > F

A. Diffuse

- throughout joint synovium

- more difficult to treat / excise fully

Benign tumour of nerve & sheath tissue

Most common benign nerve sheath tumour

- associated with NF 1

- usually arises from small cutaneous nerves

1. Localised

- most common type

- usually solitary (90%) with no genetic association

- nil malignant transormation