Differential Diagnosis in Dermatopathology

Discussions

…tage of morphea. No inflammatory cells are seen, however, in a collagenous nevus. Orientation of collagen bundles is crucial for distinguishing a late lesion of morphea from a collagenous nevus. In sections of skin that is normal, bundles of collagen…

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…

Histologic Diagnosis of Inflammatory Skin Diseases

Polymorphous light eruption

Polymorphous light eruption Synonyms Polymorphic light eruption Summer prurigo Summer eruption Eczema solare Prurigo aestivalis Chronic polymorphous light eruption Hutchinson’s summer prurigo Presentation stereotypical Age and sex Young wome…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Nevus?

“Strictly speaking, the term nevus denotes any congenital lesion of skin. Nevocellular nevus, however, refers to any congenital or acquired neoplasm of melanocytes.” Murphy GF, Mihm MC. The skin. In: Pathologic Basis of Disease. 6th ed…

Histologic Diagnosis of Inflammatory Skin Diseases

Collagen

More than 70% of the dry weight of the normal dermis consists of collagen (Fig. 1.79). The major collagens are Type I and Type III. Type I collagen has a molecular mass of about 290 KDa and accounts for approximately 80% of the total amount of colla…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.48.1A: Fibrosing dermatitis and panniculitis + 10.48.1B: Thick bundles of collagen in haphazard array replace much of the subcutaneous fat and a marked increase in number of thick-walled vessels in the upper part of the dermis =…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Chondrodermatitis Nodularis Helicis?

“At the dermatology meeting in Berlin, Jadassohn also indicated that changes in the cartilage can often be established clinically, especially the knobby sites on the helix that show a whitish transparence through a thinned epidermis. My expe…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Hyalin?

“With the high power the hyaline is seen in very varied forms, which all show the same fuchsin red reaction. The first forms a section by itself; it comprises hyaline balls of different size, which lie free between the epithelial cells, and w…