Parotitids

Reading File

Finding Sources

Searching PubMed

parotitis etiology diagnosis treatment

Reading File

I now have comprehensive content. Let me compile the full answer.

Parotitis

Parotitis refers to inflammation of the parotid gland(s). It is classified by cause into viral, bacterial (suppurative), and recurrent forms, each with distinct pathophysiology, clinical features, and management.

1. Viral Parotitis (Mumps / Epidemic Parotitis)

Etiology

The classic cause is the paramyxovirus (mumps). Less common viral causes include influenza A (notably H3N2), parainfluenza, coxsackievirus, echovirus, lymphocytic choriomeningitis virus, and HIV. It most commonly affects children under 15 years, though outbreaks in adults (e.g., hockey teams, colleges, camps) are well documented. Vaccine protection is not 100%, so cases occur even in vaccinated populations.

Tintinalli's Emergency Medicine, p. 1288
Scott-Brown's Otorhinolaryngology, p. 754

Transmission and Incubation

Spread by airborne droplets
Incubation period: 14-18 days (upper respiratory tract)
Followed by a 3-5 day prodrome of fever, malaise, headache, myalgias, arthralgias, and anorexia

Clinical Features

Bilateral parotid enlargement (may start unilaterally), resolving in ~4-5 days
Submandibular gland swelling + lymphadenopathy - can cause profound facial/neck swelling
Rarely: sublingual swelling severe enough to cause dysphagia/dysarthria
Transient facial nerve weakness (rare)

Complications

Complication	Details
Orchitis	Appears ~4-5 days post-parotitis; usually unilateral; post-pubertal males
Meningitis	Lymphocytic; occurs in 1-10% with parotitis; pleocytosis in >50%
Encephalitis / retrobulbar neuritis	Rare CNS complications
Deafness	Rare but recognized
Pancreatitis	Possible

Differential Diagnosis

Mumps is the only cause of epidemic parotitis. However, increased influenza A (H3N2) activity can also cause a parotitis cluster. Other causes of parotid swelling must be excluded (see table below).

Treatment

Supportive only (analgesia, hydration, rest)
No antiviral therapy; condition is self-limiting
Notifiable disease in most jurisdictions

2. Acute Suppurative (Bacterial) Parotitis

Pathophysiology

Caused by retrograde migration of oral bacteria into the salivary ducts when salivary flow is reduced. It is a serious infection with potential for abscess formation.

Tintinalli's Emergency Medicine, p. 1315
Scott-Brown's Otorhinolaryngology, p. 756

Risk Factors

General: dehydration, advanced age, prematurity, poor oral hygiene, diabetes mellitus, HIV, hepatic/renal failure, malnutrition, Sjogren's syndrome, hypothyroidism, cystic fibrosis
Anatomical/obstructive: sialolithiasis, ductal strictures, oral neoplasms, foreign bodies, unusual anatomy of Stensen's duct
Procedural: recent anesthesia, ERCP, tracheostomy, prolonged surgical head positioning, botulinum toxin injection
Medications causing dry mouth: diuretics, antihistamines, tricyclic antidepressants, phenothiazines, beta-blockers, barbiturates

Microbiology

Most common: Staphylococcus aureus (including MRSA in hospital/nursing home settings)
Others: Streptococcus viridans, S. pneumoniae, S. pyogenes, H. influenzae
Anaerobes: Bacteroides spp., Fusobacterium nucleatum, Peptostreptococcus, fusobacteria
Gram-negatives (E. coli, Pseudomonas) in immunocompromised patients

Clinical Features

Rapid onset of painful, tender parotid swelling
Skin overlying gland is red and warm
Pus expressible from Stensen's duct (pathognomonic)
Fever, trismus, cervical lymphadenopathy
Dysgeusia

Diagnosis

Primarily clinical
Cultures of Stensen's duct drainage (aerobic and anaerobic) to guide therapy
Ultrasound is most useful imaging: identifies abscess formation
CT if deep space involvement is suspected

Treatment

General measures:

Aggressive hydration
Massage and heat to affected gland
Sialagogues (e.g., lemon drops) to stimulate salivary flow
Discontinue offending medications

Antibiotics:

Setting	Regimen
Oral (mild, tolerating fluids)	Amoxicillin-clavulanate; or clindamycin/cephalexin + metronidazole if penicillin-allergic
Parenteral (indicated below)	Nafcillin, ampicillin-sulbactam, or vancomycin + metronidazole
MRSA risk	Vancomycin
Neonates	Gentamicin + anti-staphylococcal antibiotic + hydration

Indications for parenteral therapy: trismus, immunocompromise, failure of oral antibiotics at 48 hours, inability to swallow.

Surgical drainage is indicated if:

No clinical improvement after 3-5 days of antibiotics
Abscess formation within the gland parenchyma
Facial nerve involvement
Deep fascial space extension

Superficial parotidectomy may be required for recurrent or chronic disease.

3. Recurrent Parotitis of Childhood (Juvenile Recurrent Parotitis)

Overview

Characterized by recurrent parotid inflammation associated with non-obstructive sialectasis. The precise etiology remains unknown - no viral, immunological, or genetic cause has been confirmed. Most affected children are otherwise well.

Scott-Brown's Otorhinolaryngology, p. 758

Epidemiology

Onset typically at 3-6 years of age
Childhood onset: more common in males; adult onset: more common in females
Attacks peak between ages 5-7 years
~90% resolve by puberty

Clinical Features

Localized pain and swelling lasting up to 14 days per episode
Usually unilateral (unlike mumps)
Fever, overlying erythema, occasional mucopurulent discharge from parotid duct
Frequency: 1-5 attacks/year (up to 20 in some patients)
Serum amylase may be elevated

Investigations

Sialography and ultrasound: reveal sialectasis (may be bilateral on imaging even if disease is unilateral clinically)

Treatment

Analgesia is the mainstay - antibiotics do not shorten attacks
Sialoendoscopy and ductal dilatation (with or without saline irrigation) have been used
Intraductal iodinated oil (sialography) reported to achieve 100% reduction in recurrence in one series
Surgical options (duct ligation, nerve transection, parotidectomy) are rarely justified given the natural history of spontaneous resolution

4. Other Forms and Causes of Parotitis

Neonatal Suppurative Parotitis

A distinct entity occurring in premature neonates, treated with gentamicin + anti-staphylococcal antibiotics combined with hydration; requires surgical drainage at 24-48 hours if no improvement.

Cummings Otolaryngology, p. 456

Postsurgical / Postoperative Parotitis

Occurs in debilitated post-operative patients due to dehydration and reduced salivary flow - essentially a form of suppurative parotitis.

Cummings Otolaryngology

Causes of Salivary Gland Infection (Summary Table)

Common	Uncommon
Acute suppurative sialadenitis	HTLV-1, EBV, CMV
Mumps	Mycobacterium tuberculosis, NTM
HIV-associated salivary gland disease	Treponema pallidum (syphilitic parotitis)
HCV-associated sialadenitis	Actinomycosis, Histoplasma, Candida

Autoimmune/Systemic Causes

Parotid enlargement (not technically infectious parotitis) can be seen in:

Sjogren's syndrome (chronic dry mouth + recurrent sialadenitis)
IgG4-related disease (Kuttner tumor)
Sarcoidosis
Kimura disease
Allergic parotitis (eosinophilic sialodochitis)

5. Differential Diagnosis of Parotid Swelling

Category	Examples
Infectious	Viral (mumps, HIV), bacterial suppurative
Obstructive	Sialolithiasis, duct stricture
Inflammatory/autoimmune	Sjogren's, IgG4, sarcoidosis
Neoplastic	Pleomorphic adenoma, Warthin's tumor, mucoepidermoid carcinoma
Drug-induced	Iodine, antithyroid drugs
Metabolic	Alcoholic parotitis, bulimia, malnutrition

Sources:

Tintinalli's Emergency Medicine: A Comprehensive Study Guide, Chapter 243 (pp. 1288-1327)
Scott-Brown's Otorhinolaryngology Head & Neck Surgery, Chapter 46 (pp. 754-758)
Cummings Otolaryngology Head and Neck Surgery (pp. 456, 2103-2172)
Goldman-Cecil Medicine, Chapter 340

This is a shared conversation. Sign in to Orris to start your own chat.