Differential Diagnosis in Dermatopathology

Differential Diagnosis

Trichoadenoma Microcystic adnexal carcinoma 1. Symmetrical 1. Asymmetrical 2. Limited to the dermis 2. Extends into subcutaneous fat and sometimes into fascia and skeletal muscles 3. “Cysts” always predominates 3. “Cysts&#8…

Histologic Diagnosis of Inflammatory Skin Diseases

Alopecia areata, totalis, universalis

Synonyms Pelade Alopecia circumscripta Presentation stereotypical Age and sex Young males and females equally; familial disposition sometimes Distribution of lesions Hair-bearing skin only, especially the scalp Configuration Round, sometimes polycyc…

Histologic Diagnosis of Inflammatory Skin Diseases

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

Discussions

In a collagenous type of connective tissue nevus, known also as collagenoma, and in a lesion late in the course of morphea, abnormalities of connective tissue are observed mostly in the dermis. Bundles of collagen are thickened throughout the reticu…

Differential Diagnosis in Dermatopathology

Angiolymphoid hyperplasia with eosinophilia vs. Kimura’s disease

An inflammatory disease of children and adults that tends to involve skin and skeletal muscle mostly, the findings in the skin being patches with the color of heliotrope, especially in the periocular region. The disease manifests itself as poikilode…

Differential Diagnosis in Dermatopathology

Trichoadenoma vs. Microcystic adnexal carcinoma

An inflammatory disease of children and adults that tends to involve skin and skeletal muscle mostly, the findings in the skin being patches with the color of heliotrope, especially in the periocular region. The disease manifests itself as poikilode…

Differential Diagnosis in Dermatopathology

Morphea, late stage vs. Collagenous nevus

An inflammatory disease of children and adults that tends to involve skin and skeletal muscle mostly, the findings in the skin being patches with the color of heliotrope, especially in the periocular region. The disease manifests itself as poikilode…