Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Id Reactions?

…nd vesicular responses at a site distant to florid lesions of dermatophytosis on the feet or of allergic contact dermatitis consequent to dyes or other sensitizing components in shoes. Those spongiotic and spongiotic vesicular dermatitides are indist…

Histologic Diagnosis of Inflammatory Skin Diseases

Identification of Basic Patterns: Skin: Pustular Dermatitis

…spirochetes in rupial syphilis, of fungi in an expression of dermatophytosis (Fig. 5.322 A-D), and in diseases for which no cause is known, such as psoriasis. In short, the appearance of a pustule, as it is assessed by conventional microscopy, commu…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Telogen Effluvium—An Inflammatory Disease?

…tory telogen effluvia are predominately infectious (syphilis, dermatophytosis) but, as noted, are occasionally drug related.” Headington JT. Telogen effluvium: new concepts and review. Arch Dermatol 1993;129:361. In his seminal article about…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…n is basket-weave = Tinea versicolor ¬†Unlike the situation in dermatophytosis, in which the cornified layer usually is altered by compact orthokeratosis (a consequence of persistent rubbing) or parakeratosis that sometimes houses neutrophils, the cor…

Histologic Diagnosis of Inflammatory Skin Diseases

Confusing Terms (to be Avoided Scrupulously)

…ted by tiny vesicles on the hands of patients who have florid dermatophytosis at another site, usually the feet, or for an analogue of that phenomenon such as widespread vesicles that appear subsequent to injudicious treatment, e.g., with Gentian vio…

Histologic Diagnosis of Inflammatory Skin Diseases

Arthropod assaults

…#8220;bite,” as well as to polymorphous light eruption, dermatophytosis, Sweet’s syndrome, erysipelas, and several other “acute” inflammatory conditions that are either devoid of eosinophils or sport relatively few of them. An…

Histologic Diagnosis of Inflammatory Skin Diseases

Tinea versicolor

…ypified by longer and thinner pseudohyphae and larger spores. Dermatophytosis is characterized by longer, thinner hyphae. Laboratory confirmation Potassium hydroxide preparation reveals short, stubby, blunt-ended hyphae accompanied by round spores….

Histologic Diagnosis of Inflammatory Skin Diseases

Herpes gestationis

…t dermatitis and nummular dermatitis, and some expressions of dermatophytosis. Nonetheless, the constellation of findings histopathologic in urticarial lesions of bullous pemphigoid and herpes gestationis is nearly specific for those disorders. A pso…

Differential Diagnosis in Dermatopathology

Discussions

…y little, if any, acanthosis. Apart from the consideration of dermatophytosis, the changes in eruptive psoriasis are diagnostic of that condition. Fully developed lesions of psoriasis are marked by confluent parakeratosis with neutrophils layered in…