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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

…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….

Differential Diagnosis in Dermatopathology

Infundibular cyst vs. Isthmus-catagen cyst

…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

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…

Therapeutic Strategies in Dermatology

Hidradenitis Suppurativa: Key Points

…eas are typically involved. The classic lesions of HS include cysts, nodules, sinus tracts, and inflamed abscesses. In rare cases, lesions of pyoderma gangrenosum can occur concurrently within areas of HS or at distant sites. Hidradenitis suppurativa…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Epidermal Cyst and Epidermoid Cyst?

…arly “tricholemmal” has a lining like that of the isthmic segment only. Furthermore, that distinctive cyst probably comes into being as a consequence of a block in the process of catagen. When an involuting follicle is unable to proceed t…

Therapeutic Strategies in Dermatology

Alopecia: Key Points

…rth, or stress Metabolic Shift in ratio to mostly telogen and catagen hairs with premature termination of anagen follicles Spontaneous recovery over 6 months Anagen effluvium Rapid onset of non-inflammatory hair loss, usually <1 month following…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Eruptive Vellus Hair Cyst?

…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…

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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