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Dermatology Practical & Conceptual

Melanoma arising in a giant nevus spilus maculosus

Abstract Melanoma arising in a nevus spilus is rare. There are two distinct types of nevus spilus characterized by macular or papular speckles, respectively. We report the case of a melanoma that arose in association with a giant nevus spilus maculo…

Dermatology Practical & Conceptual

Human papillomavirus-induced periungual pigmented Bowen’s disease

Case report A 50-year-old male presented with an ill-defined hyperpigmented macule on the left pointer finger (Figure 1). The lesion was reportedly first evident one year prior to presentation. Clinically, the lesion was asymmetrical. Notably, there…

Histologic Diagnosis of Inflammatory Skin Diseases

Lichen striatus

Lichen striatus Synonyms Linear lichenoid dermatosis Presentation stereotypical Age and sex Mostly girls, but sometimes boys and young adults of both sexes Distribution of lesions Usually an extremity Arrangement of lesions Linear Individual lesions…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

…sis in infundibular, as well as surface, epidermis 7. Slight acanthosis of rete ridges of even length and breadth; some suprapapillary plates may be thin 7. Slight acanthosis rete ridges of uneven length and breadth; suprapapillary plates not thin…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.50.1A: Perivascular dermatitis, interface, and vesicular dermatitis, intraepidermal, spongiotic + 10.50.1B: Eosinophils in contiguity with numerous necrotic keratocytes = Incontinentia pigmenti, vesicular stage Inflammatory cell…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

…ically never contained wholly in a 4.0 mm biopsy specimen 2. Acanthosis and hyperpigmentation usually; epidermis sometimes thinned in the center of the lesion 2. No acanthosis or hyperpigmentation; entire surface epidermis often thinned 3. Induct…

Dermatology Practical & Conceptual

From the Dermatologikum Hamburg

The patient A 61-year-old woman presented herself with a chronic and widespread eruption of erythematous papules, pustules, ulcers, and hyperpigmented scars (Figures 1A-E). She had a history of rheumatoid arthritis. Figures 1A-E. Clinical appeara…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Pseudomalignancies?

“The term pseudocancerosis covers a variety of diseases that can be difficult to distinguish from true carcinomas not only clinically but also histologically. However, pseudocanceroses may not only be similar to squamous cell carcinomas but a…

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