Differential Diagnosis in Dermatopathology

Discussions

…that have been compared to the shape of a tadpole. Cornifying cysts and calcification are common features of syringoma, but not, as a rule, of metastases from carcinoma. Clinically, syringomas are small, yellowish-tan papules on lower eyelids, but th…

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

Hyalin?

…d degeneration. 2. a substance composing the walls of hydatid cysts.” Anderson DM, ed. Dorland’s Illustrated Medical Dictionary, 30th ed. Philadelphia: WB Saunders Company, 2003:867. “Juvenile hyaline fibromatosis Synonyms. Syste…

Differential Diagnosis in Dermatopathology

Syringocystadenoma papilliferum vs. Hidradenoma papilliferum

…solely as noninflammatory lesions, i.e., comedones and intact cysts, or as inflammatory lesions, i.e., papules, nodules, and pustules. The process may resolve without residua or with scars of different types, e.g., keloidal or atrophic, including cri…