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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…

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…

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

Epidermal Cyst and Epidermoid Cyst?

…en” in accordance with our principle of naming cutaneous cysts on the basis of the epithelial structure of adnexa that the lining of the cyst simulates most closely. In this case, the lining of the cyst mimics both isthmic and catagen epitheliu…

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?

…a benign neoplasm, not a hamartoma. Another analogue is a true cyst, rather than a cystic part of a hamartoma or of a benign neoplasm, namely, the common follicular cyst on the scalp designated isthmic-catagen cyst by us (in keeping with a system for…

Therapeutic Strategies in Dermatology

Alopecia: Key Points

Key Points Alopecia, or hair loss, has a broad spectrum of causes. In order to appropriately treat alopecia, the type of hair loss or pathophysiology must be clearly identified. The evaluation for hair loss requires a very thorough history and phys…

Dermatology Practical & Conceptual

Dermatoscopic pattern of digital mucous cyst: report of three cases

Abstract Digital mucous cysts are benign ganglion cysts of the digits typically located on the dorsal aspect of the interphalangeal joint and distal phalanx of the digits. Usually the clinical diagnosis is straightforward, though sometimes it may mi…

A Clinical Atlas of 101 Common Skin Diseases

Dermatofibroma

An inflammatory process that develops secondary to trauma, usually in the form of a penetrating injury or rupture of a follicle, and that proceeds through stages of granulation tissue with numerous extravasated erythrocytes, granulomatous inflammati…

A Clinical Atlas of 101 Common Skin Diseases

Nevus Sebaceus

A hamartoma of epidermis, epithelial structures of adnexa, and presumably dermal elements, typified, when fully formed, by a papillated or verrucous yellowish plaque situated usually on the scalp. The condition may present itself as a solitary lesio…

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