Differential Diagnosis in Dermatopathology

Trichoepithelioma vs. Infundibulocystic basal-cell carcinoma

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…

Histologic Diagnosis of Inflammatory Skin Diseases

Keloid

…, acanthosis accompanied by hyperpigmentation, and, at times, folliculosebaceous units that have been induced from surface epidermis; at nearly all stages, histiocytes and/or fibrocytes are dispersed among thickened bundles of collagen at the periphe…

Dermatology Practical & Conceptual

Review of Practical Dermatopathology, 2nd edition by Ronald P. Rapini

…, elbow, lesions); some histological (e.g., hemosiderin, horn cyst, interstitial inflammation, acantholysis), etc. For each of these nonspecific and rather arbitrary characteristics, a list of entities/diseases is given—151 lists! The most frequent e…

Histologic Diagnosis of Inflammatory Skin Diseases

Necrobiosis lipoidica

…at, as disparate as corneocytes (from a ruptured infundibular cyst) to urate (in some lesions of gout). It is easy for beginners in dermatopathology, and sometimes even for long-time practitioners, to misinterpret degeneration of collagen in necrobio…