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…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Eccrine Neoplasms?

…d type Papillary eccrine adenoma (eccrine syringocyst-adenoma papilliferum) (cutaneous ciliated cyst) Eccrine poroma Eccrine poromatosis Solid-cystic hidradenoma Hidroacanthoma simplex Syringoacanthoma Dermal duct tumor Eccrine spiradenoma Clear cell…

Differential Diagnosis in Dermatopathology

Discussions

Syringocystadenoma papilliferum and hidradenoma papilliferum are both apocrine papillated cystadenomas. Clinically, syringocystadenoma papilliferum appears at birth or in early childhood as a crusted, often weeping, verrucous plaque, usually on the…

Differential Diagnosis in Dermatopathology

Discussions

Apocrine and eccrine hidradenomas have numerous findings histopathologic in common. Their silhouette is that of a benign neoplasm, characterized as it is by symmetry, sharp circumscription, smooth borders, compressed fibrous tissue at the peripherie…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Basal-Cell Carcinoma Common in Nevus Sebaceus?

…he 52 tumors found in our series, basal cell epitheliomas and hidradenomas of various types were in the majority. . . . Basal cell epithelioma was found developing in organoid nevi in 21 instances.” Mehregan AH, Pinkus H. Life history of organo…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

Syringocystadenoma papilliferum Hidradenoma papilliferum 1. Not truly cystic (not a sac enclosed by epithelium) 1. Truly cystic (a sac enclosed completely or almost completely by epithelium) 2. Surface of skin papillated and hyperkeratotic 2….

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Origin of Adnexal Neoplasms?

…igin of adnexal neoplasms, such as trichoblastoma, sebaceoma, hidradenoma clear-cell, leiomyoma, neuroma, or hemangioma, remains recondite. In most instances, those proliferations are not continuous with epidermis (surface or infundibular) or with pr…