Search Results for: actinic squamous-cell

Histologic Diagnosis of Inflammatory Skin Diseases

Collagen

…m; and those typified by long-standing lichenoid infiltrates of lymphocytes, such as lichen planus, disseminated superficial actinic porokeratosis, and some examples of the lichenoid purpura of Gougerot and Blum (and the neoplastic process, mycosis…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Epidermal Cyst and Epidermoid Cyst?

…helium. “The commonest type of epithelial cyst of the skin is the epidermal cyst which is lined entirely by stratified squamous epithelium usually without skin appendages. . . . These cysts may arise from hair follicles, sebaceous ducts, and…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…d light. 10.38.12A: Nodular dermatitis, granulomatous + 10.38.12B: A band of histiocytes, some of them multinucleate, around squamous epithelium that, in turn, surrounds cellulose = Foreign body reaction to a splinter The splinter came to be…

Differential Diagnosis in Dermatopathology

Photoallergic dermatitis vs. Phototoxic dermatitis

…ie, the history of trauma (in both cases) often related by patients was given weight disproportionate, as was the mixture of cell types. The line between hyperplasia and neoplasia are now known to be far fuzzier that when Virchow formulated them….

Differential Diagnosis in Dermatopathology

Discussions

…, the result being lichen simplex chronicus imposed on the longstanding photoallergic dermatitis. The face of a patient with actinic reticuloid often resembles that of a lion (leonine), as does that of some patients with lymphoma or leukemia and,…

Histologic Diagnosis of Inflammatory Skin Diseases

Lupus erythematosus

…certainly is lupus erythematosus. Lupus profundus, at first glance, may be confused for a lymphoma, such as a subcutaneous T-cell one. The presence of many plasma cells in lobules, of nuclear “dust” of lymphocytes, and of sclerosis that…

Inguinal porokeratosis in a Japanese man

Inguinal porokeratosis in a Japanese man

…dominant pattern. Five different forms can be distinguished, including the plaque type of Mibelli, disseminated superficial actinic porokeratosis (some lesions of this type are distributed mainly in areas not exposed to the sun or appear in…

Histologic Diagnosis of Inflammatory Skin Diseases

Dermatomyositis

…diagnosis is discoid lupus erythematosus, and if there is a distinctive lobular panniculitis in which lymphocytes and plasma cells are joined by nuclear “dust” of lymphocytes, the diagnosis is discoid lupus erythematosus (lupus…

Histologic Diagnosis of Inflammatory Skin Diseases

Definition of Inflammation in Historical Perspective

…by redness at least and histopathologically by distinctive signs, chief among them dilation of vessels and an infiltrate of cells known conventionally as inflammatory cells. It becomes apparent, therefore, that inflammation can occur only in tissue…