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Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial...
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Immunometabolic Circuits in Infection for Advancing Host Directed Therapies
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Reactional state in lepromatous leprosy simulating Sweet's syndrome.

Tanima Das, Sandip Ghosh, Arup K Kundu

    The Journal of the Association of Physicians of India
    |July 1, 2014
    PubMed
    Summary

    Erythema nodosum leprosum (ENL), a type-III hypersensitivity reaction in leprosy, can present unusually. This case highlights the diagnostic value of skin biopsy for persistent ENL.

    Area of Science:

    • Dermatology
    • Immunology
    • Pathology

    Background:

    • Erythema nodosum leprosum (ENL), a Type-2 lepra reaction, is a manifestation of type-III hypersensitivity.
    • It typically occurs in lepromatous and borderline lepromatous leprosy cases.
    • ENL commonly presents as widespread erythematous, inflamed nodules and papules.

    Observation:

    • Rare variants of ENL can mimic other dermatological conditions like pemphigus or Sweet's syndrome (SS).
    • This report details an unusual case of persistent ENL in a 52-year-old female patient.
    • The patient presented with persistent skin lesions suggestive of ENL.

    Findings:

    • Skin biopsy and subsequent histopathological examination were crucial for diagnosing the persistent ENL.
    • Histopathology confirmed the diagnosis, differentiating it from other potential conditions.

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  • The findings underscore the importance of histopathological analysis in complex ENL cases.

    • Implications:

    • This case expands the understanding of ENL's clinical spectrum and diagnostic challenges.
    • It emphasizes the utility of skin biopsy in diagnosing persistent or atypical ENL presentations.
    • Accurate diagnosis through histopathology is vital for appropriate patient management and treatment strategies.