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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….

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…

A Clinical Atlas of 101 Common Skin Diseases

Fibrous Papule of the Face and Analogues of It

A hamartoma of mostly follicular elements that presents itself clinically as a firm, skin-colored papule. It usually occurs on the nose, but it can occur anywhere on the face. When solitary, or few, the lesion is termed “fibrous papule,” b…

Differential Diagnosis in Dermatopathology

Infundibulo-folliculo-sebaceous cystic hamartoma vs. Steatocystoma

A hamartoma of mostly follicular elements that presents itself clinically as a firm, skin-colored papule. It usually occurs on the nose, but it can occur anywhere on the face. When solitary, or few, the lesion is termed “fibrous papule,” b…

Dermatology Practical & Conceptual

Dermatoscopy of folliculosebaceous cystic hamartoma

…ngs, the patient was diagnosed with folliculosebaceous cystic hamartoma. Case presentation A 29-year-old Japanese man presented with a reddish nodule, of approximately 15 mm in diameter, on the nose (Figure 1). The lesion had gradually grown in size…

A Clinical Atlas of 101 Common Skin Diseases

Melanoma

A malignant neoplasm of melanocytes that, in the skin, begins as a macule and may become a patch or a papule. A flat lesion of melanoma tends to be asymmetrical, poorly circumscribed with a scalloped, jagged, or notched border, and variegate, mostly…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Sclerotic Fibroma?

…that condition being, at least in that setting, a distinctive hamartoma, one inherited in autosomal-dominant fashion. They did not consider what they called the sporadic solitary form of the hamartoma to be inherited. In 1991 Metcalf and others exami…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Eruptive Vellus Hair Cyst?

…tuality, since birth. Second, the lesion is not a cyst, but a hamartoma, one component of which is cystic. Third, the cystic element contains not only vellus hairs, but also corneocytes and abundant lipid. Last, eruptive vellus hair cyst is a variant…

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