Inflammation of parotid gland.

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Aetiology

• Dehydration

Infectious parotitis:

• Acute bacterial parotitis
  • M/C S. aureus, S. pyogenes and E. coli
• Extrapulmonary tuberculosis
• Acute viral parotitis (mumps)
• HIV parotitis

Autoimmune parotitis:

• Sjögren’s syndrome
• Lymphoepithelial lesion of Godwin

• Blockage

Iatrogenic causes:

• Chronic nonspecific parotitis
• Recurrent parotitis of childhood

Other associated conditions:

• Sialadenosis (sialosis)
• Sarcoidosis
• IgG4-related sialadenitis
• Pneumoparotitis
• Associated with Bulimia

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Diagnosis

Investigations

• ↑ Serum and urinary amylase

Differentialal diagnosis

• Masseteric hypertrophy
  • Can present as facial swelling in the parotid gland area and may be confused with ‘true’ parotid gland swelling