A case of sialolithiasis with actinomycosis in the minor salivary glands

A 77-year-old man presented with a painless swelling in the right side of the buccal mucosa. A tumor of the buccal mucosa was suspected on the basis of clinical and radiological findings. However, histopathogical examination of a biopsy specimen showed a sialolith accompanied by adhesion of Actinomyces, suggesting that the lesion was caused by minor salivary gland sialolithiasis and actinomycosis. As this condition has not been reported previously, the present case must be extremely rare.