Search Results for: folliculo-apocrine cystic hamartoma

A Clinical Atlas of 101 Common Skin Diseases


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,…

A Clinical Atlas of 101 Common Skin Diseases

Epidermal Nevi

Epidermal nevi are hamartomas in which the epidermis is abnormal, being hyperkeratotic, and in which lesions are aligned along Blaschko’s lines.

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Eruptive Vellus Hair Cyst?

…that of the infundibulum of epidermis, the infundibulum and isthmus being in continuity normally. In short, cutaneous cysts, cystic hamartomas, and cystic neoplasms may display more than one type of adnexal epithelium in their lining. That is the…

Histologic Diagnosis of Inflammatory Skin Diseases

Embryologic Development

…er, that is, surface and infundibular. The apocrine unit springs from the infundibulum. 1The conventional designation “folliculosebaceous-apocrine unit” is incorrect here because in an embryo, the apocrine unit derives from infundibular…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Eccrine Neoplasms?

…l adnexal structures in skin seen in the course of embryologic development or in postnatal humans. The epithelial adnexa are folliculo-sebaceous-apocrine units on one hand and eccrine units on the other; the nonepithelial adnexa are smooth muscles,…

Differential Diagnosis in Dermatopathology


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…