Salivary Gland Stones (Sialolithiasis): Symptoms, Sialendoscopy and Modern Treatment Options

Major salivary glands are three pairs: parotid (in front of the ear, draining via Stensen's duct into the cheek), submandibular (below the mandible, draining via Wharton's duct under the tongue), sublingual (under the tongue, multiple small ducts). Plus hundreds of minor salivary glands in lips, tongue, palate and cheek mucosa.

Sialolithiasis is most common in the submandibular gland (80%) — reasons: Wharton's duct is long and ascends against gravity, submandibular saliva is more alkaline with high mucus/calcium content. Parotid 15-20%, sublingual <5%, minor glands rare.

Stone formation: when saliva stagnates (dehydration, lack of sialagogues, ductal stricture, organic nidus — bacteria, mucus, desquamated epithelium), calcium phosphate and carbonate begin to precipitate. Submandibular stones are predominantly calcium phosphate; parotid stones more often calcium oxalate or organic. Single or multiple; submandibular typically 5-8 mm, parotid typically 2-4 mm.

Risk factors: male (3:2 sex ratio), 30-60 years, dehydration, poor oral hygiene, smoking, anticholinergic drugs (antihistamines, antidepressants, antipsychotics), diuretics, gout, hyperparathyroidism (calcium metabolism disorder), chronic gland disease (Sjögren syndrome, post-radiotherapy). Related service: our general ENT services.

Classic presentation: painful unilateral glandular swelling before or during meals. After eating, swelling gradually subsides. Meal-stimulated salivary flow is blocked by the stone, causing gland swelling; the swelling resolves as flow returns.

Acute suppurative sialadenitis: bacterial overgrowth in the obstructed duct causes acute inflammation — severe pain, redness, warmth, palpable tenderness, possible intraoral purulent discharge, fever, lymphadenopathy. Requires antibiotic treatment.

Chronic recurrent sialadenitis: untreated sialolithiasis leads to chronic fibrosis, gland atrophy and loss of function; "atrophic gland" develops.

Examination: bimanual palpation of the affected gland (intra- and extra-oral fingers); stones may be palpable at the duct orifice or along its course in submandibular cases. Manual milking may reveal scant, absent or purulent saliva from the duct opening.

Imaging: ultrasound (US) is first-line — radiation-free, detects stones >2 mm in 90% of cases, shows gland and duct status. With clinical suspicion, CT (salivary gland CT) provides high accuracy — especially for radiolucent or small stones, with duct system status. Sialography (contrast imaging of duct system) was the old standard; replaced largely by sialendoscopy with both diagnostic and therapeutic capability. MR sialography is a non-invasive alternative.

Differential diagnosis: parotid mass (tumour — pleomorphic adenoma, Warthin's), cystic glandular lesions (mucocele, ranula), lymphadenopathy, viral parotitis (mumps), Sjögren syndrome, bacterial sialadenitis (stoneless), chronic sclerosing sialadenitis (Küttner tumour). Bilateral or multi-glandular involvement suggests systemic disease.

Small stones (typically <4 mm, including some 5 mm submandibular) may pass with conservative measures. The approach is simple but requires disciplined application.

Hydration: at least 2-3 litres of water daily. Adequate fluid maintains salivary flow and aids stone movement.

Sialagogues: substances stimulating saliva flow — lemon (sucking lemon slice), sour candy, vinegar-containing foods, chewing gum. Applied 10-15 minutes before meals.

Warm compress and massage: warm compress over the affected gland for 10-15 minutes, then gentle persistent massage from the gland toward the duct opening. Repeated 3-4 times daily.

Antibiotics (when needed): amoxicillin-clavulanate or clindamycin 7-10 days for superinfected sialadenitis; macrolide if allergic. Active infection is treated first, then stone management.

NSAID: ibuprofen or naproxen for short-term use for pain and swelling. Reduces glandular oedema.

Medication review: review of anticholinergic (antihistamines, antidepressants, parkinsonism drugs) or diuretic use — alternatives if possible. These reduce saliva production and cause stasis.

Spontaneous passage timeline: small distal stones may pass in 1-3 weeks. Cases that do not pass in 1 month, worsen or develop infection move to interventional treatment. For the related clinical reference, see head and neck cancer symptoms.

Sialendoscopy has revolutionised the treatment of salivary gland disease over the past 20 years. Sub-millimetre to 1.6 mm semirigid endoscopes enter the duct system for direct visualisation, irrigation, dilation and stone extraction. Both diagnostic and therapeutic.

Indications: conservatively resistant palpable or imaged stones; ductal strictures; recurrent sialadenitis; non-obstructive chronic sialadenitis; symptomatic gland irrigation in Sjögren's; juvenile recurrent parotitis.

Procedure: local anaesthesia (parotid often requires general); for submandibular, the Wharton duct orifice (sublingual caruncle) is dilated and the sialendoscope advanced. The stone is visualised. Small stones (<4 mm) extracted directly with basket (Dormia) or forceps. Larger stones fragmented with laser (Holmium:YAG) or pneumatic lithotripsy and fragments removed; very large (>7 mm) or impacted stones managed by combined intraoral incision for direct access.

Advantages: gland preservation (vs total excision), minimal or no general anaesthesia, fast recovery (1-2 days), low complication rate (2-5%), often outpatient.

Success rates: 80-90% complete resolution in one session for small to medium stones; 60-75% for large or complex stones. Stricture balloon dilation and corticosteroid irrigation may be added. Recurrence is low (~5-10%).

Complications: duct perforation (rare), transient bleeding, ranula (sublingual diverticulum formation), lingual nerve sensitivity (in submandibular), infection. Major complications are uncommon.

Extracorporeal shock-wave lithotripsy (ESWL): adapted from kidney stone management. More suitable for parotid stones (anatomic reasons). Multiple sessions needed, success 30-60%. Used less with the spread of sialendoscopy.

Total gland excision: last-resort option when sialendoscopy fails, with advanced gland damage or multiple recurrences in a non-functional gland. Submandibulectomy (cervical incision), parotidectomy (very careful with facial nerve — risk of nerve injury).

Gland-preserving approach — the modern paradigm: previously the gland was removed wholesale for stones; today the priority is preserving gland and function. Sialendoscopy + transoral surgery preserve the gland in 95% of cases.

Recurrence prevention: lifestyle modification is critical. Ample fluids (3 L/day), regular sialagogue use, good oral hygiene, smoking cessation, medication review (anticholinergics, diuretics — alternatives sought).

Regular follow-up: lifelong recurrence risk. ENT review yearly or every 6 months, ultrasound as needed. Periodic sialendoscopic irrigation (especially with stenosis or Sjögren's) to "rinse" the gland.

Sjögren syndrome: needs special approach. Low-dose corticosteroid gland irrigation, pilocarpine oral saliva stimulant, immunomodulation. These patients typically have small multiple stones; symptomatic approach rather than total excision.

Acute flare management: antibiotic (amoxicillin-clavulanate 7-10 days), NSAID, warm compress, hydration, oral hygiene. Abscess: drainage. Elective sialendoscopy after the acute phase (2-4 weeks). Related reading: our Istanbul ENT services.