Figure 2 Section from the palatal tumour (A–D). (A) Polymorphous low grade adenocarcinoma (PLGA) infiltrating the palatal bone and exhibiting S-100 positivity. (B) PLGA with perineural spread and cribriform growth pattern (haematoxylin and eosin stained). (C) PLGA with cord-like growth and Indian files, next to pre-existing respiratory epithelium from the nasal cavity (haematoxylin and eosin stained). (D) PLGA with ductular growth, no Alcian blue positivity in tumour cells, but Alcian blue positivity in pre-existing salivary tissue. Section from the lung metastasis (E and F). (E) PLGA metastasis with solid fields and some ductular growth (haematoxylin and eosin stained). (F) PLGA metastasis with Indian file configuration (haematoxylin and eosin stained).