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Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.70.1A: Panniculitis, septal mostly + 10.70.1B: Fibrosing granulation tissue, abundant mucin, and scattered lymphocytes = Nodular fasciitis  The changes pictured are a response to external trauma akin to those in an early stage o…

Histologic Diagnosis of Inflammatory Skin Diseases

Behçet’s Disease

Behçet”s disease Synonyms Aphthosis Behçet Aphthosis Presentation stereotypical Age and sex Onset usually in the third decade of life with male predominance Distribution of lesions Face for acneiform lesions, lower extremities for panniculit…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.62.1A: Vasculitis, small-vessel, neutrophilic + 10.62.1B : Thrombi in the lumen of venules in the upper part of the dermis in company with innumerable extravasated erythrocytes = Livedo vasculitis, early  Necrosis of the epiderm…

Histologic Diagnosis of Inflammatory Skin Diseases

Mucha-Habermann disease

Mucha-Habermann disease Synonyms Pityriasis lichenoides Presentation stereotypical Age and sex Children and young adults especially; more common in males Distribution of lesions Widespread, particularly arms, legs, trunk, and buttocks Arrangement of…

Differential Diagnosis in Dermatopathology

Discussions

Trichoblastoma is the name generic for all benign neoplasms composed of trichoblasts and trichoblastic carcinoma is the term generic for all malignant neoplasms made up of trichoblasts. A synonym for trichoblastic carcinoma is basal-cell carcinoma….

Differential Diagnosis in Dermatopathology

Mucha-Habermann disease vs. Secondary syphilis

Alterations in the skin and subcutaneous fat, such as pigmentation and induration, secondary to the effects of long-term stasis, and ulcers that occur on the lower part of the legs as a consequence of the effects, combined, of incompetent valves of…

Differential Diagnosis in Dermatopathology

Discussions

Changes histopathologic in both lupus erythematosus profundus and panniculitis-like T-cell lymphoma involve the subcutaneous fat especially where they have in common an infiltrate, in lobules and septa, comprised mostly of lymphocytes, fat necrosis…

Differential Diagnosis in Dermatopathology

Photoallergic dermatitis vs. Phototoxic dermatitis

Alterations in the skin and subcutaneous fat, such as pigmentation and induration, secondary to the effects of long-term stasis, and ulcers that occur on the lower part of the legs as a consequence of the effects, combined, of incompetent valves of…

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