Praxis Medical Insights

Est. 2024 • Clinical Guidelines Distilled

Made possible by volunteer editors from the University of Calgary & University of Alberta

Last Updated: 10/6/2025

Pemphigus Disease Overview and Pathology

Disease Classification and Subtypes

  • Pemphigus Vulgaris (PV) is characterized by IgG antibodies directed against desmoglein 3 (Dsg3), with approximately 50-60% of patients also having Dsg1 autoantibodies, according to the British Journal of Dermatology 1
  • Oral mucosa is the first site of involvement in the majority of PV cases, with disease potentially remaining confined to mucosal surfaces or extending to involve skin, as reported by the British Journal of Dermatology 1
  • PV presents with suprabasal acantholysis and blister formation histologically, as noted by the British Journal of Dermatology 1
  • Peak frequency of PV occurs in the third to sixth decades of life, according to the British Journal of Dermatology 1

Pathophysiology

Histological Features

  • Suprabasal acantholysis and blister formation are highly suggestive of PV, as reported by the British Journal of Dermatology 1
  • Direct immunofluorescence (DIF) shows characteristic deposition of IgG in the intercellular spaces of the epidermis, according to the British Journal of Dermatology 1

Clinical Presentation

Pemphigus Vulgaris Specific Features

  • Oral erosions occur in almost all PV cases, with the oral mucosa being the first site of involvement in the majority, as noted by the British Journal of Dermatology 1
  • Oral lesions consist of small blisters or erosions found mainly on the palatal mucosa, according to the British Journal of Dermatology 1

Disease Severity Stratification

  • Studies differentiating by clinical phenotype show lower mortality in patients with predominantly mucosal PV (1-17%) compared to those with mucocutaneous PV (34-42%), as reported by the British Journal of Dermatology 1

Diagnostic Criteria

Laboratory Confirmation

  • Direct Immunofluorescence (DIF) shows IgG deposition in intercellular spaces, with a sensitivity of 89% in oral biopsies, according to the British Journal of Dermatology 1
  • Indirect Immunofluorescence (IIF) demonstrates circulating IgG binding in a linear pattern at the basement membrane, as noted by the British Journal of Dermatology 1
  • ELISA Testing offers direct measurement of Dsg1 and Dsg3 antibodies in serum, according to the British Journal of Dermatology 1

Epidemiology and Prognosis

Historical Context and Mortality

  • Before the introduction of corticosteroids, the mortality of PV was approximately 75% on average, mainly from dehydration or secondary systemic infections, as reported by the British Journal of Dermatology 1

Key Clinical Pitfalls

  • Delayed diagnosis can occur when oral lesions precede cutaneous involvement by months, and pemphigus may be misdiagnosed as other oral conditions, according to the British Journal of Dermatology 1

REFERENCES

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