Histologic Diagnosis of Inflammatory Skin Diseases

Images

…n spewed into the dermis. The blade of a microtome missed the infundibulum and, instead, sampled the changes around it. This is not a folliculitis, but an infundibulitis. 10.27.3A: Pustular dermatitis, infundibular, mixed-cell + 10.27.3B: E…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Inverted Follicular Keratosis, Tricholemmoma, and Desmoplastic Tricholemmoma?

…sthmus, the stem, and the bulb, all of which reside below the infundibulum. In short, inverted follicular keratosis is a resolving verruca vulgaris usually positioned on a face and associated with squamous eddies, and tricholemmoma is a resolving ver…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…alopecia mucinosa manifestation  Infundibular mucinosis in an infundibulum is distinguished from spongiosis there by the presence of granular basophilic material (mucin) in that epithelium. Some infundibula are dilated and plugged by orthokeratotic a…

Histologic Diagnosis of Inflammatory Skin Diseases

Apocrine Units

…he subcutaneous fat, (2) a straight duct that empties into an infundibulum at a level above the entrance of a sebaceous duct, and (3) a duct that spirals through infundibular epidermis, i.e., the apocrine acrosyringium (Fig. 1.49). In cross section,…

Differential Diagnosis in Dermatopathology

Discussions

…g folliculitis, the epithelial channel is formed always by an infundibulum, suppuration is prominent, elastic fibers in the channel are few if present at all, and, as a, rule only a single focus of change pathologic is encountered in a 4.0 millimeter…

Differential Diagnosis in Dermatopathology

Perforating folliculitis vs. Elastosis perforans serpiginosa

Infundibulitis, usually a suppurative inflammatory process that involves infundibula, is either noninfectious, as in the case of pustules of acne vulgaris, or infectious, as in the case of pustules caused by Staphylococcus aureus. In contrast, pseud…

Histologic Diagnosis of Inflammatory Skin Diseases

Arthropod assaults

…ot 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 from sebaceous glands, the latter emitting an odor (by virtue of e…

Histologic Diagnosis of Inflammatory Skin Diseases

Algorithms Predicated on “Nonspecific” Findings

…ug of Corneocytes Cast of cornified cells in a dilated infundibulum. Click image to enlarge. + Thickened epidermal basement membrane = Discoid lupus erythematosus + Spongiosis in affected infundibula, plugs of both ortho- and parakeratotic c…