Histologic Diagnosis of Inflammatory Skin Diseases

Images

…osing dermatitis + 10.37.5B: Innumerable neutrophils in an infundibulum = Suppurative infundibulitis of unknown cause and scar Florid suppurative infundibulitis, such as that shown here, leads to destruction of an infundibulum and of a follicle,…

Histologic Diagnosis of Inflammatory Skin Diseases

"Folliculitis" (Infundibulitis)

…the peri-infundibular dermis, passage through the wall of the infundibulum, and entry into the infundibular canal. When the number of neutrophils in an infundibulum becomes great sufficiently, the flow of neutrophils reverses, a huge outpouring of t…

Histologic Diagnosis of Inflammatory Skin Diseases

Identification of Basic Patterns: Skin: Pustular Dermatitis

…ccurate, therefore, to characterize a pustule positioned in an infundibulum (Fig. 5.310) as “folliculitis” when the infundibulum is epidermal, not follicular, the follicle being continuous with the infundibulum and consisting of isthmus,…

Histologic Diagnosis of Inflammatory Skin Diseases

Sebaceous Units

A sebaceous gland, a lipid-producing epithelial structure, develops in the fourth month of fetal life from a protuberance of epithelium that lies between the uppermost protrusion, which represents the future apocrine unit, and the lower bulge, which…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…richomalacia (clumps of melanin in a pleated hair shaft) in an infundibulum = Trichotillomania ¬†Often, signs of trichomalacia are present in only a single distorted hair shaft that reposes in an infundibulum, such as is the case here. At other times,…

Histologic Diagnosis of Inflammatory Skin Diseases

Embryologic Development

…apocrine duct whose lumen enters the upper part of the future infundibulum, just above the entrance of a sebaceous duct and on the side opposite it, the sebaceous duct entering the base of the infundibulum at its junction with the isthmus. Canalizat…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…infundibular + 10.22.16B: Hyphae in cornified cells of an infundibulum and a hair = Dermatophytosis This, the suppurative stage of Majocchi’s granuloma, comes into being as a result of infection by dermatophytes of cornified cells of an in…