Submandibular gland megalith eroding the floor of the mouth: a case report.

Sialolithiasis is the most common pathologic condition affecting the salivary glands. However, large sialoliths (megaliths) are considered rare. The submandibular glands are more susceptible to stone formation than are the other salivary glands. We describe the case of a 55-year-old man with an unusually large sialolith that had eroded the floor of the mouth.