Search Results for: infundibulum

Differential Diagnosis in Dermatopathology

Discussions

…r’s disease. The “perforation” seen by microscopy is an inevitable consequence of suppuration in a dilated infundibulum in which neutrophils are so numerous that they cause a breach to form in the wall of the funnel-shaped…

Histologic Diagnosis of Inflammatory Skin Diseases

Traction alopecia

…ction alopecia, but in infundibulocentric lichen planus the bandlike infiltrate of lymphocytes may extend from the top of an infundibulum to the base of a follicle, rather than along the infundibulum mostly, the fibroplasia around infundibula and…

Histologic Diagnosis of Inflammatory Skin Diseases

Errors and Reasons

…er being the result of rubbing forcefully a discrete locus made itchy by virtue of the effects of neutrophils spewed from an infundibulum on nerve endings, the situation occurring mostly in patients on renal dialysis and in some with diabetes, the…

Histologic Diagnosis of Inflammatory Skin Diseases

Algorithms Predicated on “Nonspecific” Findings

…viable epidermis = Toxic-shock syndrome     Infundibular Plug of Corneocytes Cast of cornified cells in a dilated infundibulum. Click image to enlarge. + Thickened epidermal basement membrane = Discoid lupus erythematosus + Spongiosis in…

Histologic Diagnosis of Inflammatory Skin Diseases

Arthropod assaults

…ich, not surprisingly, sometimes is caught up in the process. Not uncommonly, the actual site of the bite is an ostium of an infundibulum, that structure containing delicacies loved by insects, among them being bacteria, yeasts, mites, and lipids…

Histologic Diagnosis of Inflammatory Skin Diseases

Acne vulgaris

…ous secretion and sebum on the other. Acne vulgaris, when pustular, is a suppurative infundibulitis, not a folliculitis, the infundibulum being epidermal, not follicular. As a rule, the follicle is unaffected in acne vulgaris. Sebaceous secretion is…

Histologic Diagnosis of Inflammatory Skin Diseases

Our Definition of “Inflammation” and “Inflammatory Disease”

…s an inflammatory one. Another corollary is keratosis pilaris, in which the plug of corneocytes may penetrate the wall of an infundibulum and, as a consequence, call forth neutrophils followed by lymphocytes and, sometimes, histiocytes and later…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…lar, and peri-infundibulitis, granulomatous and fibrosing + 10.1.2B: Collections of neutrophils around a hair in a distorted infundibulum, histiocytes mostly in the vicinity immediate of the altered infundibulum, dense lymphoplasmacytic infiltrates,…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…s + 10.47.10B: Ballooned keratocytes with “margination” of nuclear chromatin and multinucleate corneocytes in an infundibulum = Infection by herpesvirus, early If a microscopist fails to take note of the subtle changes in the…

Histologic Diagnosis of Inflammatory Skin Diseases

Eccrine Units

…infundibular epidermis through surface epidermis, it having no relation to the hair follicle per se, which resides below the infundibulum, although in continuity with it. The hair itself does pass through the infundibular canal en route to reaching…