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Differential Diagnosis in Dermatopathology

Discussions

…here to clothing, particularly women’s hose. A lesion of psoriasis developed fully is a red plaque covered by thick micaceous scales. Psoriasis has no predilection for either sex, but lesions of it favor elbows, knees, intertriginous clefts, an…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Overlap Syndromes?

…erplasia to varying degree, seborrheic dermatitis differs from psoriasis by displaying scale-crusts at the lips of infundibular ostia and spongiosis in infundibula. Psoriasis differs from seborrheic dermatitis by exhibiting tortuous capillaries in de…

Differential Diagnosis in Dermatopathology

Discussions

Psoriasis on volar skin and dyshidrotic dermatitis—the latter a disease that virtually always is restricted to volar skin or skin immediately adjacent to it—often share findings histopathologic: scale-crusts, psoriasiform acanthosis, foc…

Histologic Diagnosis of Inflammatory Skin Diseases

Limitations of the Algorithmic Method

…dermis that resembles the shape of a fully developed lesion of psoriasis, conceptually all epidermal manifestations of psoriasis are psoriasiform equally, including very “early” ones, i.e., guttate and pustular, and very “late&#8221…

Differential Diagnosis in Dermatopathology

Discussions

…ith assurance. The most important attribute for distinguishing psoriasis from pityriasis rubra pilaris is the presence of neutrophils in zones of parakeratosis of psoriasis, but not in the stratum corneum of pityriasis rubra pilaris. The next most im…

Differential Diagnosis in Dermatopathology

Discussions

…e an accompaniment of it. Guttate (i.e., drop-size) lesions of psoriasis are pink, slightly scaly papules that may progress to plaques covered by micaceous scales. Guttate lesions are manifestations of psoriasis very much in the process of erupting;…

Differential Diagnosis in Dermatopathology

Discussions

Psoriasis and nummular dermatitis share several attributes histopathologic, namely, parakeratosis that often is accompanied by serum, psoriasiform acanthosis, spongiosis, edema of the papillary dermis, and an infiltrate of lymphocytes mostly around…

Histologic Diagnosis of Inflammatory Skin Diseases

Pityriasis rubra pilaris

Pityriasis rubra pilaris Synonyms Pityriasis pilaris Presentation stereotypical Age and sex Adults in about the fifth decade of life and children in the first 5 years of life; same frequency in both sexes Distribution of lesions Symmetric and widesp…

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