<prompt> What of submandibular salivary gland stones are radiopaque?10708090  <response>: 80 of submandibular salivary gland stones are radiopaque. SIALOLITHIASIS 80 of all salivary gland stones occur in submandibular glandQ, 10 occur in parotid, 7 in sublingual and the remainder in minor salivary glands. MC site is Whaons ductQ submandibular gland substance Composition of stone: Calcium and magnesium phosphate or carbonateQ Due to deposition of calcium salts, 80 stones are radio opaqueQ 