Search Results for: urtica

Histologic Diagnosis of Inflammatory Skin Diseases

Limitations of the Algorithmic Method

…1; of each inflammatory disease must be appreciated for what it is for the entire duration of it, no matter how short, e.g., urtica, or how long, e.g., necrobiosis lipoidica. Just as the seasons influence the color and patterns of birds, so, too, do…

Differential Diagnosis in Dermatopathology

Urticaria vs. Urticarial lesions of bullous pemphigoid

An inflammatory process that consists of transient, slightly erythematous, edematous papules and plaques characterized by a pseudopod-like border. They may be of either allergic or non-allergic cause, among the former being ingestants, injectants,…

Histologic Diagnosis of Inflammatory Skin Diseases

Selection of the Site

…d an infiltrate of lymphocytes in the dermis that is both deep as well as superficial and V shaped. Study histopathologic of urticarial papules of leukocytoclastic vasculitis, i.e., ones devoid of purpura, reveals a sparse perivascular and…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.31.1A: Perivascular and interstitial dermatitis + 10.31.1B: Lymphocytes and neutrophils in the dermis = Erythema marginatum The changes of erythema marginatum differ from those of urtica developed fully by absence of eosinophils.

Histologic Diagnosis of Inflammatory Skin Diseases

Arthropod assaults

…“bite” of an insect may persist for months; vigorous rubbing of such papules may induce urtication anew Papular urticaria (lichen urticatus, strophulus) refers to widespread edematous papules and papulovesicles thought in times past to…

Differential Diagnosis in Dermatopathology

Discussions

…hils are prominent in the interstitium and lymphocytes around venules. The cardinal signs that enable the differentiation of urticaria from urticarial lesions of bullous pemphigoid to be accomplished are as follows: in the former, the absence of…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Urticarial Vasculitis?

…manifestations clinical, one of which is urticarial. A clear distinction must be made between urticarial vasculitis and true urticaria. Lesions of urtica differ by being evanescent and devoid of nuclear “dust” of neutrophils and of…

Differential Diagnosis in Dermatopathology

Discussions

…deep, perivascular and interstitial, wedge-shaped infiltrates. PUPPP may have some attributes histopathologic in common with urtica, namely, sparse perivascular and interstitial mixed-cell infiltrates of lymphocytes and eosinophils. Unlike the…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

Urticarial reaction to an arthropod assault Urtica 1. Marked edema of the papillary dermis sometimes 1. No edema noticeable in the papillary dermis 2. Subepidermal vesicle sometimes secondary to marked edema of the papillary dermis 2. No…

Differential Diagnosis in Dermatopathology

Images

Urticarial reaction to an arthropod assault Urtica