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Study By Disease

Study By Disease

…ry to the sting of a wasp (Quiz #216) “Small-plaque parapsoriasis” and “large-plaque parapsoriasis” (superficial expressions, i.e., macules and patches, of mycosis fungoides) (Quiz #765) Acanthosis nigricans (Quiz #861) Acne v…

Histologic Diagnosis of Inflammatory Skin Diseases

Errors and Reasons

…lymphoma” is nothing other than “small-plaque parapsoriasis” (digitate and guttate dermatosis), that condition, in reality, being mycosis fungoides. Error: Acropustulosis of childhood, pustular bacterid, subcorneal pustular dermatos…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Erythrodermas—Nonspecific Histopathologically?

…e to confirm the opinion that the characteristic histology of psoriasis or pityriasis rubra pilaris is maintained into the stage of exfoliation.” Abrahams I, McCarthy JT, Sanders SL. 101 Cases of exfoliative dermatitis. Arch Dermatol 1963;87:1…

Histologic Diagnosis of Inflammatory Skin Diseases

Identification of Basic Patterns: Skin: Vesicular Dermatitis

…c of severe erythema multiforme. Not well appreciated is that psoriasis, very early in its course, is a spongiotic dermatitis, lymphocytes preceding neutrophils into the epidermis of it (Fig. 5.261 A&B). A caricature of the spongiotic process in…

Histologic Diagnosis of Inflammatory Skin Diseases

Lichen planus

…e for flexural surface, they not being ones of lichen planus. Psoriasis: Lesions situated on the extensor surface of the leg of dark-skinned persons, especially Africans and African-Americans, often have a violaceous cast, but they are covered by sca…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Papulosquamous Diseases?

…lowing chief diagnostic possibilities present themselves: (1) psoriasis, (2) pityriasis rosea, (3) lichen planus, (4) seborrheic dermatitis, (5) tinea corporis, (6) secondary syphilis. [Also included among the papulosquamous eruptions in this chapter…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Spongiform Pustular Diseases?

…ules of Kogoj and Munro microabcesses are truly diagnostic of psoriasis, and, in their absence, the diagnosis can rarely be made with certainty on a histologic basis.” Mobini N, Toussaint S, Kamino H. Noninfectious erythematous, papular, and s…

Differential Diagnosis in Dermatopathology

Discussions

Pale-cell acanthoma and a plaque of psoriasis have numerous attributes histopathologic in common. Both are characterized by elongated epidermal rete ridges and correspondingly elongated dermal papillae. The long papillae house dilated, tortuous capi…

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