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Differential Diagnosis in Dermatopathology

Discussions

Distinction histopathologic between lichen planus-like keratosis and most solar keratosis is not difficult in some instances. When, however, a solar keratosis is accompanied by lichenoid infiltrates of lymphocytes, it may have many attributes in com…

Histologic Diagnosis of Inflammatory Skin Diseases

Gout

Gout Presentation stereotypical Age and sex Predominantly men Distribution of lesions Localized to ears and small joints, such as those of big toes Arrangement of lesions Discrete Individual lesions Papules, nodules, and even tumors Course Protracte…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.20.1A: Nodular dermatitis, granulomatous + 10.20.1B: Numerous extravasated erythrocytes, siderophages, and fibrocytes = Dermatofibroma An important finding for diagnosis of a dermatofibroma such as this one is seen at the periph…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

-oid?

“-oid (-oid) [eides, like]. A suffix signifying likeness or resemblance.” Bould G. The Practitioner’s Medical Dictionary. 3rd ed. Philadelphia, PA: P. Blakiston’s Son & Co., 1916:622. “-ode, -odes, -oid, -oides […

Histologic Diagnosis of Inflammatory Skin Diseases

Pyogenic granuloma

Pyogenic granuloma Synonyms Capillary hemangioma Presentation stereotypical Age and sex Children and young adults of both sexes Distribution of lesions Fingers and toes, lips, buccal mucosa, and trunk Individual lesions Sessile papules at first ulce…

Dermatology Practical & Conceptual

Nodules on the right ear

Case report A healthy 17-year-old boy with a one-year history of asymptomatic, slowly enlarging nodules affecting his right ear was seen. The patient’s past medical history was unremarkable, he was not immunosuppressed, he was not taking any d…

Histologic Diagnosis of Inflammatory Skin Diseases

Nephrogenic fibrosing dermopathy

Nephrogenic fibrosing dermopathy Presentation stereotypical Age and Sex Adults of either sex, rarely children Distribution of lesions Extremities, particularly legs and feet, less often trunk and buttocks Arrangement of lesions Confluence to plaques…

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…

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