Diagnosis is confirmed histologically by tissue biopsy. Blastomycosis is histologically associated with granulomatous nodules. Pseudoporphyria is a bullous photosensitivity that clinically and histologically mimics porphyria cutanea tarda. These mixed lesions consist of histologically distinct epithelial and mesenchymal tissues (7). Each phase has several morphologically and histologically distinguishable sub-phases. Intestinal metaplasia is classified histologically as complete or incomplete. Ovarian cancers are histologically and genetically divided into type I or type II. Acrylamide intoxication resembles neural axotomy histologically and mechanically. An intact herpetic vesicle presents as an intraepithelial blister histologically. This tissue is then examined histologically for characteristics of cancer. Perioral dermatitis is frequently histologically similar to rosacea with the two conditions overlapping considerably. The villi of the duodenum have a leafy-looking appearance, which is a histologically identifiable structure. However, it prevents atherosclerosis (which histologically mirrors atherosclerosis in humans) in target animals vaccinated. A bowel adjoins the stomachs, whose individual sections can only be distinguished histologically. Area 19 is a histologically delineated band anterolaterally abutting visual area 18.