Search Results for: itch-scratch sequence

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Differential Diagnosis in Dermatopathology

Discussions

…rickettsiae of the Rochalimaea family and not bacilli of cat-scratch disease as was thought when the organisms first were detected. The name now given to the organism is Rochalimaea henselae. Clumps of purplish granular material in a pyogenic granul…

Differential Diagnosis in Dermatopathology

Pyogenic granuloma vs. Bacillary angiomatosis

A papular and pustular inflammatory process that is centered in follicles and is distributed mostly in the middle third of the face in both vertical and horizontal directions. Among the varied manifestations of rosacea are innumerable telangiectases…

Histologic Diagnosis of Inflammatory Skin Diseases

Scrofuloderma

…ied to the surface of the skin through numerous sinuses. This sequence of events is a reflection of how depressed severely is the resistance immunologic of the host to tubercle bacilli. Caseous necrosis, in itself, is an indication of that impotence….

Histologic Diagnosis of Inflammatory Skin Diseases

Lupus vulgaris

…nd to be bilateral. Lupus vulgaris results from the following sequence of events: tubercle bacilli, having been inhaled, cause pulmonary tuberculosis in one or both lungs; bacilli travel by blood vessels to the skin of the face where they are deposit…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…rse the epidermis, they may come to assume the appearance, in sequence, of a “Munro’s microabscess,” “spongioform pustule,” “subcorneal pustule,” and intracorneal pustule. Those are merely different names for…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

….94.10C + 10.94.10D + 10.94.10E + 10.94.10F = Rhinophyma  The sequence of events in this lesion of rhinophyma was rupture of infundibular cysts, suppurative peri-infundibulitis followed by suppurative granulomatous peri-folliculitis, and, in time, by…

Histologic Diagnosis of Inflammatory Skin Diseases

Epidermis

…igned parallel to the skin surface. At the conclusion of this sequence of changes, each elongated waferlike corneocyte covers an area occupied by about 25 basal keratocytes. The corneocytes themselves are stacked in orderly columns that resemble pie…

Histologic Diagnosis of Inflammatory Skin Diseases

Definition of Inflammation in Historical Perspective

…he skin, an organ that is vascularized richly, there ensues a sequence of responses of blood vessels of small caliber (transient vasoconstriction, arteriolar dilation, increased rate of blood flow, dilation of capillaries and venules, increased perme…

Histologic Diagnosis of Inflammatory Skin Diseases

Cells That Mediate Inflammation (Inflammatory Cells)

…species of Staphylococcus, Streptococcus, and Neisseria. The sequence of events in phagocytosis is chemotaxis, adherence, engulfment, and digestion of foreign matter. Chemotaxis is the process whereby migrating leukocytes are directed toward injurio…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…ith adjacent dermis = Keratosis pilaris  The changes are a consequence of steadily increasing pressure applied by a plug of cornified cells against infundibular epidermis, thereby thinning that epithelium progressively and eventually destroying it. I…

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