Histologic Diagnosis of Inflammatory Skin Diseases

Applicable Terms

ABSCESS [L. abscessus (a going away)]: Clinically, a circumscribed collection of pus and histopathologically a localized collection of neutrophils. An abscess may form in the epidermis, both surface and infundibular, eccrine ducts, dermis, and subcu…

Histologic Diagnosis of Inflammatory Skin Diseases

Confusing Terms (to be Avoided Scrupulously)

APOPTOSIS [Gk. apo- (away from) + ptosis (a falling)]: Reputed to be a specific type of cell death in which dead cells are said to undergo fragmentation by implosion with subsequent phagocytosis of nuclear debris (Fig. 3.40). The process is claimed…

Histologic Diagnosis of Inflammatory Skin Diseases

Psoriasis

Psoriasis Presentation stereotypical Age and sex Persons of any age and of both sexes Distribution of lesions Localized, e.g., single papule or plaque, or universal, i.e., erythroderma; between these extremes, a preference for elbows and knees, scal…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Spongiform Pustular Diseases?

“The pustule I have designated spongiform (spongelike) was markedly and impressively seen in acrodermatitis continua of Hallopeau. It is composed of leukocytes that have migrated into the soaked epidermis, destroying epithelial cells by inva…

Histologic Diagnosis of Inflammatory Skin Diseases

Identification of Basic Patterns: Skin: Pustular Dermatitis

See Fig. 5.307 A&B. Figure 5.307 Pustular dermatitis. A. Infundibular. B. Surface epidermal. Although most pustules in skin are housed in infundibular epidermis (Fig. 5.308 A&B), many are lodged in surface epidermis (Fig. 5.309 A&B)….

Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.90.1A: Perivascular dermatitis, psoriasiform + 10.90.1B: Lymphocytes and neutrophils around venules, dilated tortuous capillaries in edematous dermal papillae, spongioform pustules, and tiers of neutrophil-containing mounds of p…