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Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.79.1A: Diffuse dermatitis, neutrophils predominant, and panniculitis, lobular + 10.79.1B: Brown fungi characterized by a thick wall = Phaeohyphomycosis ┬áThis condition is a subcutaneous variant of chromomycosis. Fungi reside mos…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.75.1A: Panniculitis, lobular + 10.75.1B: A distinctive organism present in number, neutrophils around the organism, and histiocytes around the neutrophils = Panniculitis induced by a nematode ┬áThe organism is Dirofilaria ursi….

Histologic Diagnosis of Inflammatory Skin Diseases

Crohn’s disease

…may appear concurrently, e.g., infundibulitis, vasculitis, and panniculitis. “Metastatic” Crohn’s disease is a misleading term meant to signify granulomatous dermatitis and panniculitis at sites remote from the ends of the gastroint…

Differential Diagnosis in Dermatopathology

Discussions

…ermatitis, and when it involves the subcutaneous fat, of lupus panniculitis (lupus profundus)—the dermatitis and panniculitis of lupus erythematosus is analogous to lupus carditis, lupus nephritis, lupus encephalitis, lupus arthritis, lupus ser…

Differential Diagnosis in Dermatopathology

Discoid lupus erythematosus vs. Polymorphous light eruption

An inflammatory process that expresses itself in the skin in protean ways that are variations on a basic pathologic theme, and includes evanescent patches on the face (“butterfly blush”), scaly papules and plaques that resolve with atrop…

Histologic Diagnosis of Inflammatory Skin Diseases

"Folliculitis" (Infundibulitis)

“Folliculitis” (Infundibulitis) Synonyms What is designated, universally, folliculitis is, in actuality, infundibulitis. In short, infundibulitis is NOT a synonym for folliculitis; the former, for purposes practical, is a suppurative pro…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Churg-Strauss Granuloma and Allergic Granulomatosis?

“The occurrence of a clinical syndrome of severe asthma, fever, and hypereosinophilia, together with symptoms of vascular embarrassment in various organ systems, has been established. . . . The basic anatomical changes . . . consisted of wide…

Differential Diagnosis in Dermatopathology

Atrophic lichen planus vs. Atrophic discoid lupus erythematosus

An inflammatory process that expresses itself in the skin in protean ways that are variations on a basic pathologic theme, and includes evanescent patches on the face (“butterfly blush”), scaly papules and plaques that resolve with atrop…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Discoid Lupus Erythematosus versus Systemic Lupus Erythematosus? II

“Lupus erythematosus is a disorder associated with innumerable clinical signs and symptoms and a wide range of laboratory abnormalities; it shows a spectrum of varying prognoses ranging from a benign, solely cutaneous variant (localized disco…

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