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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…

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…

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 exam…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Eruptive Vellus Hair Cyst?

…lomatricoma, unlike steatocystoma, is 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 cy…

Differential Diagnosis in Dermatopathology

Discussions

Infundibulo-folliculo-sebaceous cystic hamartoma and steatocystoma are both cystic hamartomas. Neither is simply a cyst because the structures that comprise each of them are not mere epithelium-lined sacs that house fluid or solid elements, but are…

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