Ultrastructural assessment of adenoid cystic carcinoma with emphasis on tumour infiltration periphery

The ultrastructural assessment of adenoid cystic carcinoma revealed that the cells in the peripheral parts of the tumour show a lower degree of maturation than the ones in its centre, peripheral stroma contains fewer collagen fibres, and dominant elements at the periphery of the tumour are proteoglycans and glycosaminoglycans, no histoformative features typical of the principal (central) part of the tumour were found at its periphery.