Sialadenitis & Parotitis
Painful swelling of the salivary glands (usually parotid or submandibular) caused by bacterial infection, viral mumps, stones, or autoimmune disease.
Emergency Management: Ludwig's Angina or Parapharyngeal Abscess: Severe swelling elevating the floor of the mouth and displacing the tongue. Requires immediate securing of the airway (often awake fiberoptic intubation or tracheostomy) and urgent surgical decompression.
Sialadenitis is the inflammation of a salivary gland, most commonly the parotid or submandibular glands. It can be acute or chronic, and is primarily caused by bacterial or viral infections, obstructive mechanisms (sialolithiasis), or autoimmune destruction. Parotitis specifically refers to inflammation of the parotid gland.
Detailed Overview
Acute bacterial sialadenitis (suppurative sialadenitis) usually occurs in elderly, debilitated, or dehydrated patients where salivary stasis allows retrograde ascent of oral bacteria (Staphylococcus aureus) up the salivary duct. Viral parotitis is classically caused by the Mumps virus. Chronic sialadenitis often stems from recurrent obstructions by salivary stones (sialoliths), primarily in the submandibular duct (Wharton's duct) due to its tortuous, uphill course and alkaline, mucin-rich saliva. Autoimmune parotitis is a hallmark of Sjogren syndrome.
Epidemiology & Demographics
Bacterial sialadenitis predominantly affects elderly or post-operative dehydrated patients. Sialolithiasis affects 1% of the adult population, most commonly between 30-60 years of age. Submandibular stones are 4 times more common than parotid stones.
Etiological Mechanism
Acute bacterial is overwhelmingly Staphylococcus aureus. Viral is Mumps paramyxovirus, though HIV and Coxsackievirus are implicated. Obstructive is caused by calcium phosphate stones. Autoimmune involves lymphocytic infiltration in Sjogren syndrome.
Primary Causes
Staphylococcus aureus infection
Sialolithiasis (Salivary Stones)
Mumps Virus
Dehydration and Salivary Stasis
In acute bacterial sialadenitis, decreased salivary flow compromises the mechanical flushing and antimicrobial properties of saliva (lysozyme, IgA). Commensal oral flora ascends the Stensen (parotid) or Wharton (submandibular) duct, causing acute suppurative inflammation, microabscess formation, and purulent discharge. In sialolithiasis, calcium salts deposit around a nidus of desquamated cells or mucus, forming a calculus. The stone partially or totally occludes the duct, leading to saliva backing up during meals (mealtime syndrome), increasing intraparenchymal pressure, causing intense pain, and eventually leading to chronic glandular fibrosis and acinar atrophy.
Diagnostic Criteria & Guidelines
Largely a clinical diagnosis based on history and physical exam (expression of pus). Imaging is required to identify stones or rule out abscess formation.
For Acute Bacterial: Aggressive IV hydration, application of warm compresses, sialagogues (lemon drops) to stimulate flow, and IV antibiotics covering S. aureus and anaerobes: Ampicillin-Sulbactam 3g IV q6h OR Clindamycin 600mg IV q8h + Ciprofloxacin. For small stones: Conservative management with massage and hydration.
Second-Line & Adjunctive Therapy
For unresponsive infection or formed abscess: Surgical Incision and Drainage of the gland. For recurrent stones: Sialendoscopy (minimally invasive endoscopic basket retrieval of the stone) or lithotripsy.
Surgical & Procedural Management
Sialadenectomy (surgical excision of the entire submandibular or parotid gland) is reserved for severe chronic refractory sialadenitis or intractable giant stones. Parotidectomy carries a high risk of Facial Nerve (CN VII) injury.
Patient Counseling & Advice
Advise patients to frequently massage the gland from back to front toward the mouth to promote drainage and prevent stasis. Warn about the signs of spreading neck infection (difficulty breathing or swallowing).
Follow-Up & Monitoring Schedule
Clinical re-evaluation in 48-72 hours to ensure antibiotic response and rule out abscess formation.
Preventive Strategies
Hydration and avoidance of anticholinergic medications in susceptible populations.
Excellent with prompt antibiotic therapy and hydration. Obstructive sialadenitis tends to recur unless the underlying stone is completely removed.