Sialolithiasis

Sialolithiasis - Stone Cold Facts

• Definition: Salivary gland stones.
• Epidemiology: Middle-aged adults; M > F.
• Most Affected Glands:
  • Submandibular (80-90%): 📌 SMART (SubMandibular Anatomy Reasons for Trouble (Stones)) - Wharton's duct (long, tortuous, upward); saliva (↑ viscosity, alkaline, ↑ mucin, ↑ Ca).
  • Parotid (10-20%).
  • Sublingual/Minor (1-2%).
• Pathogenesis: Stasis, inflammation, organic nidus, calcium phosphate deposition.
• Risk Factors: Dehydration, anticholinergics, smoking, gout, hyperparathyroidism, ductal stenosis.

⭐ Submandibular gland is most commonly affected (80-90%) due to the long, tortuous, upward course of Wharton's duct and thicker, alkaline, mucin-rich saliva.

Sialolithiasis - Salty Symptoms Show

• Hallmark: Intermittent, painful gland swelling, worse with meals (📌 'mealtime syndrome' / 'gustatory colic').
• Symptoms:
  • Pain, swelling, tenderness.
  • Palpable stone (if superficial).
  • ↓ or absent salivation (affected duct).
  • Recurrent sialadenitis.
• Signs:
  • Stone palpable bimanually along duct.
  • Purulent discharge from duct (if infected).
• Location Specifics:
  • Submandibular: palpable in mouth floor.
  • Parotid: near Stensen's duct opening.

⭐ 'Mealtime syndrome' (colicky pain/swelling with meals due to salivary stimulation) strongly suggests sialolithiasis.

Sialolithiasis - Spotting the Stone

• Clinical Examination:
  • Inspection: Glandular swelling, redness over duct orifice.
  • Palpation: Firm, tender gland; stone may be palpable (bimanual palpation for submandibular gland).
• Imaging Modalities:
  • X-rays (Occlusal/Panoramic): Show radiopaque stones (Submandibular ~80-90%, Parotid ~50-60% radiopaque).
  • Ultrasound (USG): Initial modality. Detects stones >2mm, ductal dilatation. Non-invasive.
  • Sialography: Visualizes ductal system, filling defects. Contraindicated in acute infection or iodine allergy.
  • CT Scan (Non-contrast): High sensitivity for small/radiolucent stones, intraglandular stones.
  • MR Sialography: Non-invasive, no radiation, good for ductal anatomy.
  • Sialendoscopy: Diagnostic and therapeutic; direct visualization.

⭐ High-resolution non-contrast CT (HR-NCCT) is the gold standard for detecting salivary stones, especially small or radiolucent ones.

Sialolithiasis - Stone Eviction Plan

• Conservative Management (First-line): Hydration, sialogogues, gland massage, moist heat. Analgesics; antibiotics for infection.
• Minimally Invasive Techniques:
  • Sialendoscopy: For stones < 5mm (SMG duct), < 3mm (parotid). Basket retrieval, laser/mechanical lithotripsy.
  • ESWL: For solitary, radiopaque stones < 10mm (parotid/SMG).
• Surgical Approaches (if others fail/unsuitable):
  • Transoral Ductal Slitting/Sialodochotomy: For palpable distal duct stones.
  • Sialadenectomy (Gland Removal): Last resort. Large/multiple intraglandular, recurrent stones; severe gland damage; failed interventions.

⭐ Sialendoscopy has revolutionized management, offering a gland-preserving, minimally invasive approach for both diagnosis and treatment of most sialoliths.

Sialolithiasis - Dodging Duct Drama

• Complications & Sequelae:
  • Acute/chronic sialadenitis
  • Ductal stricture/stenosis
  • Glandular atrophy/fibrosis (due to chronic obstruction/inflammation)
  • Abscess formation
  • Salivary fistula (rare)
• Prevention Strategies:
  • Adequate hydration
  • Good oral hygiene
  • Management of underlying risk factors (e.g., gout)

⭐ Chronic obstruction from sialolithiasis can lead to irreversible glandular damage and atrophy, emphasizing the need for timely management.

High‑Yield Points - ⚡ Biggest Takeaways

• Most common: Submandibular gland (Wharton's duct) due to alkaline, viscous saliva & upward duct course.
• Composition: Primarily calcium phosphate; mostly radio-opaque (80-90% submandibular).
• Key symptom: Mealtime syndrome - colicky pain and swelling with meals.
• Diagnosis: Palpation, X-ray (occlusal view), USG, CT. Sialography can be diagnostic.
• Management: Conservative (sialogogues), transoral removal, sialendoscopy, or gland excision for refractory cases.
• Parotid stones are less frequent, often smaller and may be radiolucent more often than submandibular stones.