Sialolithiasis.

Sialolithiasis occurs most commonly in the submandibular gland. The vast majority of salivary stones are single, with only 3 percent occurring bilaterally. Patients with distal submandibular stones may be treated with simple sialolithotomy. Other causes of salivary gland enlargement include mumps, tumors, acute suppurative sialadenitis and granulomatous disease.