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

Identification of Basic Patterns: Subcutaneous Fat: Panniculitis

See Fig. 5.385 A-C. Figure 5.385 Patterns of panniculitis. A. Septal mostly. B. Lobular mostly. C. Septal and lobular “equally.” At scanning magnification, the normal subcutaneous fat is seen to be segregated by struts of fibrous tiss…

Histologic Diagnosis of Inflammatory Skin Diseases

Rosacea

Rosacea Synonyms Gutta rosea Presentation stereotypical Age and sex Young and middle-aged adults, usually Caucasian women Distribution of lesions Center of the face in vertical and horizontal directions, i.e., nose, forehead, cheeks, and chin Indivi…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

Trichoblastoma, trichoepitheliomatous type Trichoblastic (basal-cell) carcinoma, nodular type 1. Ulceration uncommon and always secondary to trauma 1. Ulceration common 2. Neoplasm symmetrical 2. Neoplasm asymmetrical 3. Neoplasm well-circum…

Histologic Diagnosis of Inflammatory Skin Diseases

Pheohyphomycosis

Pheohyphomycosis Synonyms Phaeomycotic cyst Subcutaneous pheaohyphomycosis Presentation stereotypical Age and sex No predilection for age or sex, but more common in individuals who reside in the tropics; most of those persons not immunocompromised…