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- Presentation
Practice Pearls for Diagnosing Pemphigus and Pemphigoid Disorders
Description
The talk focuses on diagnosing pemphigus and pemphigoid disorders, emphasizing various clinical presentations beyond the typical forms, which can include urticarial lesions, annular erythema, and involvement of mucous membranes and nails. It stresses the importance of correlating clinical and histopathologic findings, utilizing both serum and tissue-based testing, such as direct immunofluorescence (DIF) and ELISA testing, to confirm diagnoses. Specific cases illustrate that patients may present without blisters, leading to delays in diagnosis. Key points include the necessity of proper biopsy techniques, the variability in histologic presentation, and the potential for incorrect assumptions based on initial findings, such as mistaking pemphigus for dermatitis. The speaker highlights that sometimes subepidermal blistering disorders may lack eosinophils or might present with mixed immunofluorescent patterns. Additionally, the conditions can be associated with systemic disorders and drug reactions. The importance of a high index of suspicion for autoimmune blistering diseases, along with accurate immunopathologic testing, is emphasized as critical for effective diagnosis and management.
View moreConclusions
- A variety of clinical presentations can signify autoimmune blistering disorders like pemphigus and pemphigoid, necessitating a high index of suspicion for accurate diagnosis.
- Histopathological findings alone may raise suspicion for pemphigus and pemphigoid but are not sufficient for diagnosis, emphasizing the need for comprehensive immunopathological testing.
- Direct immunofluorescence (DIF) testing is essential for diagnosing pemphigus and pemphigoid, and its results should guide further serological testing.
- Evolving forms of bullous pemphigoid can present with itch and no blisters, complicating diagnosis and revealing the importance of assessing pruritus in differential diagnoses.
- The presence of subepidermal blisters with varying inflammatory cell infiltrate patterns may indicate different subtypes of pemphigoid, requiring careful histopathological evaluation.
- Serum-based antibody testing, particularly for BP180 and BP230, plays a crucial role in accurately diagnosing pemphigoid variants, especially when DIF results are inconclusive.
- Misdiagnosis may occur if proper immunopathological tests are not obtained, highlighting the critical nature of thorough diagnostic protocols in autoimmune blistering disorders.
- Christiaan V. Bakker, MD; Jorrit B. Terra, MD; Hendri H. Pas, PhD; Marcel F. Jonkman, MD, PhD (2013). Bullous Pemphigoid as Pruritus in the Elderly, JAMA Dermatol., 149(8), 950-953. doi:10.1001/jamadermatol.2013.756.