Search Results for: infundibulo-sebaceous-apocrine unit

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Common Baldness—an Inflammatory Disease?

…creased percentages of telogen follicles and telogen germinal units. An inflammatory reaction was seen in 75% of patients and focal fibrosis was seen in 25%. Diffuse dermal fibrosis with destruction of follicular structures was present in 5% of the s…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

…licular differentiation; no associated follicular papillae 3. Sebaceous cells and lobules often accompany follicles induced by histiocytes and fibrocytes 3. No sebaceous cells or lobules accompanying 4. No clefts between epithelial elements and strom…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Discoid Lupus Erythematosus versus Systemic Lupus Erythematosus? II

…tration limited solely to the skin, and affecting chiefly the sebaceous glands and the parts immediately adjacent to them, ending in complete absorption, or in a cicatricial contraction of the skin, and not in any way affecting the patient’s ge…

Histologic Diagnosis of Inflammatory Skin Diseases

"Folliculitis" (Infundibulitis)

…nother in the manner of normal infundibula Individual lesions Infundibulocentric papules, pustules, and nodules Course Possibly resolving in days or persisting for weeks or months Variations clinical Infectious infundibulitis: suppurative Noninfectio…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Follicular Degeneration Syndrome?

…., the isthmus whose boundaries are the point of entry of the sebaceous duct into the base of infundibular epidermis above and the site where corneocytes of the inner sheath desquamate below. The lower transient segment consists of a stem and a bulb….

Differential Diagnosis in Dermatopathology

Acne vulgaris, erythematous papule vs. Rosacea, erythematous papule

…sted clinically as erythematous papules and pustules that may become confluent to form plaques in the case of the former and erosions in the case of the latter. The nail unit may be affected by paronychia and the oral cavity by “thrush.”…

Histologic Diagnosis of Inflammatory Skin Diseases

Foreign body reaction

…and digest the material that is “foreign,” e.g., sebaceous secretion, cornified cells, bacteria, yeast, and mites from a ruptured infundibulum, but many times their efforts are in vain; silica, suture, material of tattoos, urates, and sp…

Differential Diagnosis in Dermatopathology

Images

Apocrine mixed tumor Eccrine mixed tumor…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

Apocrine (clear-cell) hidradenoma Eccrine (poroid) hidradenoma 1. Connects to infundibula often 1. No connection to infundibula; merges with surface epidermis rarely 2. Glandular structures usually 2. Ductal structures usually 3. “Decapitatio…