Differential Diagnosis in Dermatopathology

Differential Diagnosis

Infundibular cyst Isthmus-catagen cyst 1. Cyst lining consists of stratified squamous epithelium that resembles normal infundibular epidermis, i.e., the cells flatten as they mature; the granular zone persists 1. Cyst lining consists of stratifi…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Telogen Effluvium—An Inflammatory Disease?

…ting follicles which have performed the ritual of involution, catagen, in the prescribed [sic] fashion. Inflammatory signs or other histologic abnormalities are necessarily minor or absent or else the follicle could not conclude its growing phase in…

Histologic Diagnosis of Inflammatory Skin Diseases

Telogen effluvium

…psy specimen, at least one and sometimes two follicles are in catagen Correlation clinicopathologic In the first few weeks of the process, the usual complement of follicles still is in anagen, and, therefore, no alopecia is detectable clinically. Ab…

Differential Diagnosis in Dermatopathology

Common baldness vs. Telogen effluvium

A hamartoma of epidermis, epithelial structures of adnexa, and presumably dermal elements, typified, when fully formed, by a papillated or verrucous yellowish plaque situated usually on the scalp. The condition may present itself as a solitary lesio…

Histologic Diagnosis of Inflammatory Skin Diseases

Applicable Terms

…cognizable clinically results from rupture of an infundibular cyst and the circumstance in which that develops most often is “cystic” acne vulgaris. An abscess centered in an infundibulum is known as a furuncle (Fig. 3.2A), it being cause…

Histologic Diagnosis of Inflammatory Skin Diseases

Alopecia areata, totalis, universalis

…icles often in what seems to be the end of anagen or in early catagen; as a rule, nearly all the follicles are in the same stage of devolution Fully developed Lymphocytes and melanophages at the base of fibrous tracks that represent collapse of per…