Histologic Diagnosis of Inflammatory Skin Diseases

"Folliculitis" (Infundibulitis)

…irm papules, and on the nose by a combination of infundibular cysts and sebaceous hyperplasia (rhinophyma). Pyoderma gangrenosum often starts out as suppurative infundibulitis and galvanizes to become extensive suppurative dermatitis and panniculitis…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Myxoma?

…CV Mosby Co., 1989:1607. “Two types of digital mucous cysts exist. One type is analogous to focal (popular) mucinosis and represents a myxoma.” Lever WF, Schaumburg-Lever G. Tumors of fibrous tissue. In: Histopathology of the Skin. 7th…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…nd hairs, is encountered in the vicinity of some infundibular cysts that have ruptured. 10.38.9A: Nodular dermatitis, granulomatous + 10.38.9B: Histiocytes, many of them multinucleate, contiguous with suture = “Suture granuloma”…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Follicular Occlusion Triad?

…,” a reference to the vague resemblance of infundibular cysts of acne conglobata to balls of different sizes. The image, however, conveys no sense for the nature fundamental of the disease, to wit, a suppurative infundibulitis accompanied often…

Differential Diagnosis in Dermatopathology

Syringocystadenoma papilliferum vs. Hidradenoma papilliferum

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…

Dermatology Practical & Conceptual

When all you have is a dermatoscope—start looking at the nails

…to invasive melanocytes of the melanoma) and several keratin cysts of the adjacent skin (corresponding to areas of keratinization of the squamous cell carcinoma) (Figure 14A, B). Figure 14. Squamomelanocytic tumor of the nail unit as a genuine co…