Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Urticarial Vasculitis?

“Although necrotizing angiitis (vasculitis) of the superficial venules and capillaries of the skin is usually appreciated visually as a purpuric papule, a group of patients has been defined in whom all of the skin lesions were urticarial. Mic…

Histologic Diagnosis of Inflammatory Skin Diseases

Leukocytoclastic vasculitis

Leukocytoclastic vasculitis Synonyms Leukocytoclastic angiitis Allergic vasculitis Hypersensitivity angiitis Hypersensitivity vasculitis Anaphylactoid purpura Immune complex vasculitis Purpura rheumatica Presentation stereotypical Age and sex Any ag…

Histologic Diagnosis of Inflammatory Skin Diseases

Livedo vasculitis

Livedo vasculitis Synonyms Livedoid vasculopathy Atrophie blanche Atrophie alba PURPLE (painful purpuric ulcers with reticular pattern of the lower extremities) Livedo reticularis with summer ulcerations Livedo with ulceration Milian’s white…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Mucha-Habermann Disease a Lymphocytic Vasculitis?

…change in pityriasis lichenoides et varioliformis acuta is a vasculitis, differing from pityriasis lichenoides chronica, which is primarily a disease of the epidermis…Very important and never described previously in this disease is the invasio…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Necrotizing Vasculitis?

…in Pathol 1952;22:777–90. “Cutaneous necrotizing vasculitis is an inflammatory process that involves vessels of all sizes …. The sequence of pathologic events in vasculitis is best illustrated in necrotizing venulitis of the superf…

Histologic Diagnosis of Inflammatory Skin Diseases

Septic vasculitis

Septic vasculitis Synonyms Infectious angiitis Presentation stereotypical Age and sex Young adults of both sexes Distribution of lesions Widespread usually Arrangement of lesions Scattered Individual lesions Red macules, petechiae, hemorrhagic vesic…

Differential Diagnosis in Dermatopathology

Erythema nodosum vs. Nodular vasculitis

An arteritis in the subcutaneous fat manifested clinically at first by one or more red nodules that, in time, become ulcerated and heal with scars, usually on the posterior aspect of the legs of short, thick-legged women. No cause is usually found,…

Differential Diagnosis in Dermatopathology

Nodular vasculitis vs. Subcutaneous polyarteritis nodosa

An arteritis in the subcutaneous fat manifested clinically at first by one or more red nodules that, in time, become ulcerated and heal with scars, usually on the posterior aspect of the legs of short, thick-legged women. No cause is usually found,…

Histologic Diagnosis of Inflammatory Skin Diseases

Nodular vasculitis

Nodular vasculitis Presentation stereotypical Age and sex Middle-aged, thick-legged women Distribution of lesions Usually bilateral and symmetrical on the calves Individual lesions Nodules tending to ulcerate Course Lesions resolving slowly in month…

Histologic Diagnosis of Inflammatory Skin Diseases

Nodular vasculitis

An arteritis in the subcutaneous fat manifested clinically at first by one or more red nodules that, in time, become ulcerated and heal with scars, usually on the posterior aspect of the legs of short, thick-legged women. No cause is usually found,…