12.1 Salivary Gland Disease
Key Takeaways
- Sialolithiasis most often affects the submandibular gland (Wharton duct) because of long uphill duct course and viscous, calcium-rich saliva; intermittent mealtime swelling and a palpable stone are classic.
- Acute bacterial sialadenitis presents with painful swollen gland, pus from the duct orifice, fever, and systemic signs—hydrate, massage, sialagogues when duct is patent, and antibiotics for bacterial infection; rule out obstruction.
- Mucocele is a mucus extravasation phenomenon (usually lower lip from trauma); ranula is a floor-of-mouth mucocele from the sublingual gland—plunging ranula extends through mylohyoid into the neck.
- Sjögren syndrome is an autoimmune exocrinopathy causing dry mouth and dry eyes; secondary disease pairs with other connective-tissue disease, and patients have elevated lymphoma risk plus rampant caries risk from xerostomia.
- Pleomorphic adenoma is the most common salivary neoplasm (especially parotid); Warthin tumor is bilateral/multifocal in older male smokers; mucoepidermoid carcinoma is the most common malignant salivary tumor; adenoid cystic carcinoma invades nerves and shows perineural spread.
12.1 Salivary Gland Disease
Quick Answer: Sort salivary problems by obstruction, infection/inflammation, mucus extravasation, autoimmune xerostomia, or neoplasm. Sialoliths favor the submandibular gland. Mucocele = lower lip trauma; ranula = floor of mouth (sublingual). Sjögren = dry eyes + dry mouth ± systemic autoimmunity and lymphoma risk. Tumors: pleomorphic adenoma (most common overall), Warthin (older smokers, parotid), mucoepidermoid ca. (most common malignancy), adenoid cystic ca. (perineural invasion).
Salivary disease sits at the junction of oral medicine, oral pathology, and surgery on the AFK. Items test gland anatomy (parotid → Stensen; submandibular → Wharton; sublingual → multiple ducts of Rivinus ± Bartholin), fluid dynamics, and classic vignettes. Always ask: which gland, acute vs chronic, obstructive vs autoimmune vs neoplastic, and whether the duct orifice yields clear saliva or pus.
Anatomic and Functional Framework
| Gland | Type of saliva | Duct | Clinical relevance |
|---|---|---|---|
| Parotid | Serous | Stensen (opposite maxillary 2nd molar) | Mumps, bacterial sialadenitis, most neoplasms; facial nerve traverses parenchyma |
| Submandibular | Mixed, more mucous | Wharton (floor of mouth, near lingual frenum) | Most sialoliths; mealtime swelling |
| Sublingual | Mucous | Rivinus / Bartholin | Ranula origin |
| Minor glands | Mostly mucous | Short ducts throughout mucosa | Mucocele (lower lip), minor gland tumors (palate common site for intraoral malignancies) |
Xerostomia is the symptom of dry mouth; hyposalivation is objectively reduced flow. Causes include drugs (anticholinergics, antidepressants, antihistamines, antihypertensives), Sjögren, radiation to head/neck, dehydration, uncontrolled diabetes, and mouth breathing. Consequences: caries (especially cervical/root), candidiasis, dysgeusia, difficulty speaking/swallowing, prosthesis intolerance.
Sialolithiasis (Salivary Stones)
| Feature | Teaching points |
|---|---|
| Most common gland | Submandibular (~80%) — long duct, uphill course against gravity, higher calcium, more mucinous saliva |
| Symptoms | Recurrent mealtime swelling and pain; may be intermittent; chronic obstruction → infection |
| Exam | Bimanual palpation of floor of mouth; stone may be visible/palpable near duct orifice; reduced or absent flow |
| Imaging | Occlusal radiograph for radiopaque Wharton stones; panoramic; sialography/ultrasound/CT/CBCT as needed; some stones radiolucent |
| Management | Hydration, moist heat, massage toward orifice, sialagogues (sour lemon) if infection controlled; antibiotics if sialadenitis; ductal dilation/sialendoscopy; surgical removal of stone or gland if recurrent/intraglandular |
AFK pearl: pain and swelling that flare during meals point to intermittent duct obstruction until proven otherwise.
Sialadenitis
Acute bacterial sialadenitis
Typically ascending infection (Staphylococcus aureus classic in older dehydrated patients; streptococci and mixed oral flora also). Predisposing factors: dehydration, duct obstruction, poor oral hygiene, recent surgery, xerostomia, immunosuppression.
| Feature | Detail |
|---|---|
| Clinical | Sudden painful swollen gland, erythema, fever, malaise; purulent discharge from duct orifice when massaged |
| Parotid | Common site for acute suppurative sialadenitis in debilitated patients |
| Management | Hydration, antibiotics covering staph/oral flora, analgesia, gland massage if duct patent, warm compresses; drain abscess if fluctuance; address obstruction |
| Danger | Spreading deep neck infection, airway risk (especially submandibular space continuity concepts) |
Viral sialadenitis
Mumps (paramyxovirus): bilateral tender parotid enlargement, fever; orchitis/oophoritis/pancreatitis/meningitis complications in some; vaccination prevents most cases. HIV-associated salivary disease can include lymphoepithelial cysts of the parotid and xerostomia.
Chronic and recurrent sialadenitis
Repeated obstruction/infection leads to duct ectasia, scarring, and reduced function. Juvenile recurrent parotitis is a pediatric entity with recurrent non-obstructive parotid swelling. Management emphasizes hydration, sialagogues, antibiotics for flares, and sialendoscopy in selected adults; gland excision for end-stage disease.
Sialadenosis (sialosis): non-inflammatory, non-neoplastic enlargement (often bilateral parotid) associated with diabetes, alcoholism, malnutrition, bulimia—no pus, minimal pain.
Mucocele and Ranula
| Entity | Mechanism | Site | Clinical | Management |
|---|---|---|---|---|
| Mucocele (mucus extravasation) | Duct trauma → mucus leaks into soft tissue (not a true epithelium-lined cyst; often "extravasation phenomenon") | Lower lip classic; also buccal mucosa, ventral tongue | Bluish soft fluctuant swelling; history of lip biting; may rupture and recur | Surgical excision including feeder minor gland; avoid only unroofing |
| Mucus retention cyst | Duct obstruction → true epithelial lining (less common teaching label) | Minor glands | Similar swelling | Excision |
| Ranula | Mucocele of sublingual gland | Floor of mouth, unilateral bluish swelling | Elevates tongue if large | Marsupialization vs excision of sublingual gland (lower recurrence with gland removal) |
| Plunging (cervical) ranula | Extension through mylohyoid into neck | Floor of mouth + neck mass | Soft neck swelling ± oral component | Imaging; surgical approach addressing sublingual gland |
Differential for floor-of-mouth swelling: ranula, sialolith with obstruction, dermoid/epidermoid cyst (midline doughy), abscess, neoplasm—imaging and aspiration/surgery as indicated.
Sjögren Syndrome
Chronic autoimmune disease targeting exocrine glands (lymphocytic infiltration).
| Feature | Detail |
|---|---|
| Primary Sjögren | Dry mouth + dry eyes without another major CTD |
| Secondary Sjögren | With rheumatoid arthritis, SLE, systemic sclerosis, etc. |
| Oral | Hyposalivation, sticky mucosa, difficulty swallowing dry foods, candidiasis, rampant caries (especially cervical), enlarged salivary glands in some |
| Ocular | Keratoconjunctivitis sicca (gritty eyes, reduced tears) |
| Serology (awareness) | Anti-SSA/Ro, anti-SSB/La; RF, ANA often positive |
| Diagnosis support | Clinical criteria, ocular tests (Schirmer), salivary flow, labial minor gland biopsy (focal lymphocytic sialadenitis), serology—multidisciplinary |
| Major risk | Increased non-Hodgkin lymphoma (especially MALT lymphoma of parotid)—persistent unilateral hard gland enlargement needs investigation |
| Dental management | Aggressive prevention: fluoride, diet, saliva substitutes/stimulants (pilocarpine/cevimeline if not contraindicated), treat candida, short recall, avoid unnecessary anticholinergic drugs |
AFK trap: not every dry mouth is Sjögren—drugs are the most common cause of xerostomia overall. Look for systemic/autoimmune context and objective hyposalivation.
Salivary Gland Tumors — High-Yield Map
General rules:
- Parotid hosts most salivary tumors; most parotid tumors are benign.
- As gland size decreases (parotid → submandibular → sublingual/minor), the proportion malignant rises.
- Palate is the most common site for minor gland tumors.
- Facial nerve weakness with a parotid mass suggests malignancy until proven otherwise.
- Definitive diagnosis is histopathology (FNA helps triage; surgery often diagnostic and therapeutic).
Benign tumors
| Tumor | Classic profile | Notes |
|---|---|---|
| Pleomorphic adenoma (benign mixed tumor) | Most common salivary neoplasm; middle-aged adults; slow painless mobile mass, usually superficial parotid | Histology: epithelial + myxochondroid stroma; incomplete capsule → recurrence if enucleated only—treat with adequate margins (e.g., superficial parotidectomy). Rare malignant transformation with long-standing lesions (carcinoma ex PA) |
| Warthin tumor (papillary cystadenoma lymphomatosum) | Older adults, male predominance historically, smokers; almost exclusive to parotid; may be bilateral or multifocal | Soft cystic mass; low recurrence after excision; not a cancer |
| Basal cell adenoma / others | Less common | Know they exist; PA and Warthin dominate stems |
Malignant tumors
| Tumor | Classic profile | Notes |
|---|---|---|
| Mucoepidermoid carcinoma | Most common malignant salivary tumor; parotid and palate common | Mucous + epidermoid + intermediate cells; grade drives prognosis (low-grade better); may present as painless mass or, if palate, as a firm swelling ± ulcer |
| Adenoid cystic carcinoma | Common among minor gland and submandibular malignancies | Slow growth but relentless; perineural invasion → pain, nerve deficits; cribiform "Swiss cheese" histology classic; late distant metastasis (lung) possible; wide excision ± adjuvant therapy |
| Acinic cell carcinoma | Often parotid; relatively better prognosis than many malignancies | Low-intermediate grade spectrum |
| Polymorphous adenocarcinoma | Minor glands (palate) in older adults | Infiltrative but often indolent |
| Carcinoma ex pleomorphic adenoma | Long-standing PA with sudden growth/pain/nerve palsy | Malignant transformation |
Clinical red flags for malignancy
| Red flag | Implication |
|---|---|
| Rapid growth | Concern for malignancy or infarction of benign tumor |
| Pain, especially neuralgic | Perineural invasion (adenoid cystic classic) |
| Facial nerve paralysis | Parotid malignancy until proven otherwise |
| Fixation to skin/deep tissues, ulceration | Advanced disease |
| Cervical lymphadenopathy | Regional metastasis |
| Hard unilateral gland in Sjögren | Lymphoma workup |
Necrotizing Sialometaplasia (Awareness)
Self-limiting inflammatory condition of minor salivary glands (hard palate classic) that mimics squamous cell or mucoepidermoid carcinoma clinically and sometimes histologically. Presents as a crateriform ulcer after ischemia (trauma, local anesthetic, ill-fitting denture). Biopsy confirms; heals over weeks—avoid overtreatment once diagnosed.
Integrated Approach and AFK Stems
| Presentation | First-line thinking |
|---|---|
| Mealtime submandibular swelling | Sialolith / obstruction |
| Fever + tender parotid + pus from Stensen | Acute bacterial sialadenitis |
| Bluish lower lip blister after biting | Mucocele |
| Unilateral floor-of-mouth blue swelling | Ranula |
| Dry eyes + dry mouth + rampant caries ± CTD | Sjögren spectrum |
| Slow mobile parotid mass, middle age | Pleomorphic adenoma until proven |
| Soft parotid mass, older male smoker, bilateral | Warthin |
| Palatal mass ± pain | Minor gland tumor—biopsy; malignant until cleared |
| Painful fixed parotid mass + facial weakness | Malignancy pathway |
Rapid review list
- Submandibular = sialolith king; mealtime symptoms
- Bacterial sialadenitis = sick patient + pus from duct
- Mucocele lower lip; ranula floor of mouth; plunging through mylohyoid
- Sjögren: autoimmunity, caries, candida, lymphoma risk
- PA most common tumor; Warthin = smoker, bilateral parotid
- Mucoepidermoid most common malignancy; adenoid cystic = nerves
- Smaller glands → higher % malignant; palate for minor glands
Section 12.2 expands systemic diseases that declare themselves in the mouth; many produce secondary salivary hypofunction or mucosal change that overlaps this differential.
Which salivary gland is most frequently affected by sialolithiasis, and what clinical pattern is most characteristic?
A young adult has a soft bluish fluctuant swelling in the floor of the mouth that elevates the tongue. Which diagnosis and gland of origin are most likely?
Which statement about Sjögren syndrome is most accurate for dental practice and AFK items?
A middle-aged patient has a slow-growing, painless, mobile mass in the superficial parotid. Which neoplasm is most common, and which surgical principle applies?