Differential Diagnosis in Dermatopathology

Urticarial reaction to an arthropod assault vs. Urtica

…les may be centered in follicles (Majocchi’s granuloma). Lesions may occur on any anatomic site, but particularly on the scalp (tinea capitis), inguinal region (tinea cruris), hands (tinea manum), feet (tinea pedis), and nails (onychomycosis)….

Histologic Diagnosis of Inflammatory Skin Diseases

Granuloma annulare

…n or young adults as deep-situated nodules, especially on the hands and buttocks, and in the pretibial region. Perforating granuloma annulare presents itself usually on the dorsa of hands as tiny umbilicated papules topped by crusts. Widespread granu…

Dermatology Practical & Conceptual

Letter to the Editor

…topathologist in his report is irrelevant to me. On the other hand, if the melanoma has hemolymphatic invasion or neurotrophic differentiation, I would be more worried. Only a few histopathological features-whether it is in situ or not, if there is v…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…ted in dermatitis herpetiformis and in linear IgA dermatosis, diseases that are unaccompanied by any sign of vasculitis. 10.58.18A: Vasculitis, small-vessel, neutrophilic + 10.58.18B: Abundant nuclear “dust” of neutrophils and f…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Myxoma?

…neoplasms accompanied by variable quantities of mucin on one hand and large deposits of mucin on the other. Mucin may be manufactured by either cells epithelial or nonepithelial. In epithelial (follicular) mucinosis, for example, it is mostly infund…

Histologic Diagnosis of Inflammatory Skin Diseases

Silica granuloma

…ue, they causing rents unavoidable, no matter how skilled the hand. Laboratory confirmation Polarized light reveals particles of silica to be brilliant and doubly refractile. Spectrographic analysis demonstrates the presence of silicon dioxide. Cause…

Dermatology Practical & Conceptual

Melanoma arising in a giant nevus spilus maculosus

…error cannot be excluded. Papular nevus spilus, on the other hand, is characterized by dark brown papules or nodules on a light-brown background, although small dark spots may also be present [3]. Histopathologically, this type of nevus spilus shows…

Differential Diagnosis in Dermatopathology

Apocrine mixed tumor vs. Eccrine mixed tumor

…les may be centered in follicles (Majocchi’s granuloma). Lesions may occur on any anatomic site, but particularly on the scalp (tinea capitis), inguinal region (tinea cruris), hands (tinea manum), feet (tinea pedis), and nails (onychomycosis)….