12    Tumours,Cysts  ulcers  sinuses

12.1     Tumours

12.2     Benign tumours

12.3     Malignant tumours

12.4      Benign to malignant transformation

12.5     Cysts

12.6     Ulcers

12.7     Sinuses and fistulas

12.8     Acknowledgement

12.9     Further reading