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Differential Diagnosis in Dermatopathology

Differential Diagnosis

Dermatofibroma, hemorrhagic papulo-nodule Kaposi’s sarcoma, hemorrhagic papulo-nodule 1. Poorly circumscribed; border sometimes jagged 1. Well-circumscribed; border smooth 2. Epidermis acanthotic and hyperpigmented 2. Epidermis thinned a…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Endothelial Swelling?

…pe. The same can be said for the potential for progression; a nodule, for example, of abnormal melanocytes, cannot be judged through a microscope to be “expansile!” Endothelial cells, like all types of cells, can be described morphologica…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Inverted Follicular Keratosis, Tricholemmoma, and Desmoplastic Tricholemmoma?

…dy. These lesions are characterized clinically by a papule or nodule, practically always single and usually projecting from the surface. The character of the cells comprising the central cellular mass ranges from what is natural for a cell immediatel…

Histologic Diagnosis of Inflammatory Skin Diseases

Granuloma annulare

…screte Individual lesions Papules and plaques in the skin and nodules in the subcutaneous fat Course As a rule, resolving slowly over months without residua; atrophic macules or patches are remnants rarely Variations clinical Subcutaneous granuloma…

Histologic Diagnosis of Inflammatory Skin Diseases

Foreign body reaction

…ns Localized usually Individual lesions Papules, plaques, and nodules Course Longstanding Variations clinical Rupture of an infundibular cyst produces a foreign body reaction that is the most common in the skin. Bovine collagen injected in the sk…

Histologic Diagnosis of Inflammatory Skin Diseases

Identification of Basic Patterns: Skin: Pustular Dermatitis

…tule (suppurative infundibulitis) or as an inflamed papule or nodule (suppuration secondary to rupture of an infundibular cyst) (Fig. 5.315 A&B). Not every suppurative infundibulitis progresses invariably to granulomatous and fibrosing peri-infun…

Differential Diagnosis in Dermatopathology

Discussions

…e presents itself typically as a solitary pink-purple papule, nodule, or plaque on a face. Lesions multiple on a face especially or on any other site anatomic, and tending to be agminated were diagnosed a few decades ago as “pseudolymphoma&#822…

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