The primordial cyst (odontogenic keratocyst): its tumour-like characteristics and behaviour.

The clinical behaviour of primordial cysts frequently mimics that of benign tumours. They are characterised by aggressive growth and a tendency to recur following surgical treatment. Displacement of teeth, resorption of the roots of teeth, 'seeding' of the cyst into soft tissue and pathological fracture of the mandible exemplify this behaviour. These features are described and fully illustrated by examples from a series of 60 cases. The results of various surgical procedures are evaluated.