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A Clinical Atlas of 101 Common Skin Diseases

Cysts and Cystic Hamartomas

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Papules, nodules, and tumors that, on gross examination, are usually skin colored and, on histopathologic examination, consist of an epithelium-lined sac that contains fluid, cells, or both in the case of true cysts and of cysts that are associated with other epithelial elements of adnexa in the case of cystic hamartomas.

A Clinical Atlas of 101 Common Skin Diseases

Cysts and Cystic Hamartomas

Papules, nodules, and tumors that, on gross examination, are usually skin colored and, on histopathologic examination, consist of an epithelium-lined sac that contains fluid, cells, or both in the case of true cysts and of cysts that are associated…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Epidermal Cyst and Epidermoid Cyst?

…e no infundibula on volar skin. Whether an epidermal inclusion cyst truly is an expression of artefactual transplantation of epidermal epithelium into the dermis or really is a retention cyst lined by metaplastic eccrine ductal epithelium is not know…

Therapeutic Strategies in Dermatology

Hidradenitis Suppurativa: Key Points

Key Points Hidradenitis suppurativa (HS) is a chronic inflammatory process affecting skin bearing apocrine glands; the groin, axillae, and inframammary areas are typically involved. The classic lesions of HS include cysts, nodules, sinus tracts, an…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Eruptive Vellus Hair Cyst?

…onent. One or more vellus follicles are joined directly to the cyst. Those follicles generate hairs that eventually become lodged within the lipid-filled cystic cavity. Sometimes apocrine glands and ducts, and even eccrine glands and ducts, are affil…

Differential Diagnosis in Dermatopathology

Infundibular cyst vs. Isthmus-catagen cyst

Papules, nodules, and tumors that, on gross examination, are usually skin colored and, on histopathologic examination, consist of an epithelium-lined sac that contains fluid, cells, or both in the case of true cysts and of cysts that are associated…

Therapeutic Strategies in Dermatology

Appendigeal Tumors: Overview

Adnexal Tumors Both benign and malignant tumors may arise from the cutaneous adnexa (hair follicles, sweat glands, and sebaceous glands). Treatment First Steps A biopsy is usually necessary to establish the diagnosis, except for syringomas. Surgica…

A Clinical Atlas of 101 Common Skin Diseases

Squamous Cell Carcinoma

A malignant neoplasm of keratinocytes that when present as a keratotic macule or papule on skin damaged badly by sunlight is referred to as solar keratosis. When present as a plaque it is termed Bowen’s disease, and when present as many papule…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Eccrine Neoplasms?

…denoma or acrosyringeal nevus Comedo nevus of the palm, linear eccrine nevus with comedone, porokeratotic eccrine ostial nevus or porokeratotic eccrine duct and hair follicle nevus. Eccrine adenoma Eccrine hidrocystoma or cystadenoma Syringoma: class…

Histologic Diagnosis of Inflammatory Skin Diseases

Eccrine Units

The eccrine gland is the only true sweat gland in humans. Eccrine sweat is a hypotonic solution that flows from the gland to the surface of the skin where it cools the body by evaporation. Eccrine units are present nearly everywhere on human skin, i…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Eccrine, Apocrine, and Apoeccrine Sweat Glands?

…1; There is only one authentic sweat gland in man, and that is eccrine alone. The sweat that pours from the skin on all sites anatomic is produced by eccrine glands. In sections stained by hematoxylin and eosin, those glands situated usually in the d…

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