1. Where there is good evidence that a lesion is neoplastic, this will be stated in the brief definition of the lesion that precedes the detailed description.
2. Where there is good evidence that a lesion represents a developmental anomaly or malformation, this will also be stated in the brief definition.
3. In accordance with common practice, the terms `lesion’ and ‘lesional tissue’ will be used for both neoplastic and non-neoplastic disorders.
4. Synonyms are given where they have been widely used in the literature; the preferred term is given first, followed by the synonym in brackets.