Search Results for: suppuration

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…10.17.7B: Innumerable organisms with a round, gray nucleus and a clear capsule situated at the periphery of patchy zones of suppuration = Cryptococcosis The capsule of cryptococcosis is demonstrated better by PAS, as shown in the section pictured…

Differential Diagnosis in Dermatopathology

Erythema nodosum vs. Nodular vasculitis

Infection of skin and subcutaneous tissue by atypical mycobacteria, that is, mycobacteria other than those responsible for tuberculosis and leprosy, expressed clinically as keratotic and crusted papules, plaques, nodules, and tumors that may be…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…pustular psoriasis. 10.22.5A: Pustular dermatitis, infundibular + 10.22.5B: Hyphae in the cornified layer = Dermatophytosis Suppuration that begins in an infundibulum may extend upward and come to repose beneath the stratum corneum, the result…

Histologic Diagnosis of Inflammatory Skin Diseases

Sarcoidosis

…who have indisputable sarcoidosis. In our experience, granulomatous dermatitides that are sarcoidal, tuberculoid, or free of suppuration or necrosis fail consistently to reveal an infectious agent, no matter how many specialized stains are employed…

Histologic Diagnosis of Inflammatory Skin Diseases

Erythema nodosum leprosum

…ormed lesions of erythema nodosum leprosum, foamy histiocytes are dispersed widely in lobules. Erythema nodosum is devoid of suppuration, whereas erythema nodosum leprosum is typified by zones of suppuration. The infiltrate of inflammatory cells in…

Histologic Diagnosis of Inflammatory Skin Diseases

Pyoderma gangrenosum

…volved infundibulum, and still later, the original infundibular character of the process no longer can be recognized because suppuration is so great. The elevated boggy border of the lesion is formed by dense diffuse infiltrates of neutrophils. That…

Differential Diagnosis in Dermatopathology

Perforating folliculitis vs. Elastosis perforans serpiginosa

Infection of skin and subcutaneous tissue by atypical mycobacteria, that is, mycobacteria other than those responsible for tuberculosis and leprosy, expressed clinically as keratotic and crusted papules, plaques, nodules, and tumors that may be…

Histologic Diagnosis of Inflammatory Skin Diseases

Factitious dermatitis and panniculitis

…njected into the skin, a suppurative lobular panniculitis unlike any associated with authentic disease is induced. Extensive suppuration in one or more fat lobules in the absence of vasculitis or other cause apparent should alert to the possibility…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

…he form of necrosis en masse, fat “microcysts,” and membranous fat necrosis, as well as of many foam cells 8. No suppuration in the subcutaneous fat 8. Suppuration prominent in the subcutaneous fat, especially in lobules 9. Eosinophils…