Sialolithiasis is a generally considered to be a relatively rare disease in children. I lowever, we recently diagnosed sialolithiasis in the left submandibular duct of an aged 3 years and 2 months. Although routine microscopic examination of the enucleated specimen revealed sialolithiatic components similar to those described by other authors, transmission electron microscopy showed needle-like crystalline substances of high electron density in bacteroid corpuscles suggesting the possible involvement of endobacillary calcification in the development of sialolithiasis.
