Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Eccrine, Apocrine, and Apoeccrine Sweat Glands?

“Evidence is presented that in adult human axillae there exists a third type of sweat gland tentatively designated as the apoeccrine sweat gland. This type of gland shows a segmental or diffuse apocrinelike dilatation of its secretory tubule…

Differential Diagnosis in Dermatopathology

Discussions

Trichoadenoma and microcystic adnexal carcinoma at times resemble each other sufficiently to pose a dilemma diagnostic, even though the former is a hamartoma and the latter an adenocarcinoma. Both may have several findings histopathologic in common:…

Histologic Diagnosis of Inflammatory Skin Diseases

Lymphadenosis benigna cutis

Lymphadenosis benigna cutis Synonyms Borrelial pseudolymphoma Presentation stereotypical Age and sex Any age and either sex Distribution of lesions Localized usually to an ear lobe, the nose, a nipple or areola, or the scrotum; lesions on the ear ar…

Differential Diagnosis in Dermatopathology

Study By Disease

“Blue nevus” (Jadassohn-Tièche) (Quiz #360) “Blue nevus” (Jadassohn-Tièche) (Quiz #525) “Blue nevus” (Masson’s blue neuronevus) (Quiz #359) “Collagenous” nevus, papillary dermal type* (Quiz #11…

Differential Diagnosis in Dermatopathology

See Classification of Pigmented Lesions

Non-melanocytic lesions Inflammatory Post-inflammatory hyperpigmentation Dermatofibroma Hamartomas Collagenous nevus, papillary dermal type Nevoid hyperkeratosis of the nipple Benign neoplasms Solar lentigo, including lichen planus-like ker…

Differential Diagnosis in Dermatopathology

Pigmented Lesions

Non-melanocytic lesions Inflammatory Post-inflammatory hyperpigmentation (523, 649) Melanophages in number variable scattered in the papillary dermis, rarely in the upper part of the reticular dermis too. Melanin increased in amount in the epi…

Differential Diagnosis in Dermatopathology

Trichoadenoma vs. Microcystic adnexal carcinoma

An inflammatory process caused by the acarus Sarcoptes scabiei and consisting of papules, papulovesicles, papulopustules, and vesicles, some arranged in linear or curvilinear tracks (burrows). Sometimes nodules are present, especially in the interdi…

Differential Diagnosis in Dermatopathology

Discussions

A proliferation of keratocytes that simulates squamous-cell carcinoma and authentic squamous-cell carcinoma itself have findings histopathologic in common, including epithelial cells that cornify, nuclei of epithelial cells that are not entirely typ…