Differential Diagnosis in Dermatopathology

Keloid vs. Hypertrophic scar

Papules, nodules, and tumors that, on gross examination, are usually skin colored and, on histopathologic examination, consist of an epithelium-lined sac that contains fluid, cells, or both in the case of true cysts and of cysts that are associated…

Differential Diagnosis in Dermatopathology

Discussions

…undulations of rete ridges as in proliferations of melanocytes like simple lentigines, junctional nevi of Clark’s type especially, and malignant melanoma in situ; sclerotic collagen in the upper part of the dermis, as in the lichen sclerosus et…

Histologic Diagnosis of Inflammatory Skin Diseases

Erythema figuratum

Erythema figuratum Synonyms Erythema figuratum perstans Figurate erythema Annular erythema Presentation stereotypical Age and sex Adults of both sexes, but women especially Distribution of lesions Localized or widespread, trunk and proximal extremit…

Histologic Diagnosis of Inflammatory Skin Diseases

Erythema multiforme

Erythema multiforme Synonyms Herpes iris Ectodermis erosive pluriorificialis Erytheme polymorphe Erythema multiforme exsudativum minor (Erythema multiforme minor, Erythema multiforme simplex, Erythema papulosum [Papular erythema multiforme]) Present…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Xerosis, Asteatosis, Asteatotic Eczema, Eczema Craquelé, and Dry Skin?

“Asteatosis Synonyms: Xerosis. Ger asteatose; Fr ast√©atose Definition: Asteatosis is that condition of the skin in which there is absolute or relative deficiency of the sebaceous secretion.” Ormsby OS, Montgomery H. Diseases of the app…

Histologic Diagnosis of Inflammatory Skin Diseases

Acne vulgaris

Synonyms Acne simplex Presentation stereotypical Age and sex Adolescents of both sexes; usually more severe in males. May affect neonates. Distribution of lesions Regions in which large sebaceous units are joined to vellus follicles, i.e., the face,…

Histologic Diagnosis of Inflammatory Skin Diseases

Degos’ disease (malignant atrophic papulosis)

Degos’ disease (malignant atrophic papulosis) Synonyms Degos’ syndrome Malignant atrophic papulosis Papulosis atrophicans maligna Koehlmeier-Degos syndrome Thromboangiitis cutaneointestinalis disseminata Fatal cutaneointestinal syndrome…

Histologic Diagnosis of Inflammatory Skin Diseases

Pancreatic panniculitis

Pancreatic panniculitis Synonyms Pancreatitis with subcutaneous fat necrosis Systemic nodular fat necrosis Pancreatic enzyme panniculitis Nodular fat necrosis Weber-Christian syndrome of pancreatic origin Presentation stereotypical Age and sex Fourt…