Commonest salivary gland to get stones:
|C||Minor salivary gland|
• 80% of all salivary gland stones occur in submandibular gland, 10% occur in parotid, 7% in sublingual and the remainder in minor salivary glands.
MC site is Wharton’s duct- submandibular gland substance
• Composition of stone: Calcium and magnesium phosphate or carbonate
• Due to deposition of calcium salts, stones are radio opaque
Submandibular salivary gland calculi are more common than parotid because
• Wharton’s duct has long, curved and upward course and is hooked by lingual nerve leading to inadequate drainage.
• Secretion is more viscid than parotid gland secretion
• Pain and swelling of submandibular region, aggregated by food, classically by sucking a lemon
• Stone impacted in the duct may produce the referred pain in the tongue due to irritation of lingual nerve, as it hooks around the submandibular duct
• Stone in the duct is removed by giving incision directly over the stone in long axis
• Excision of submandibular gland when stone is in the gland substance