title: Unstained negative image patterns. A checkpoint for quality slides.
abstract: Before stains were available, pathologists had to rely on unstained sections viewed through crude microscopes, but they still were able to make diagnoses and discoveries. Unstained sections may still be used to advantage in making diagnoses of skin lesions quickly, accurately, and easily on the basis of negative image patterns. Low-power scanning by conventional microscopy of freshly cute and mounted, still wet, paraffin sections of skin specimens enables the histotechnologist and dermatopathologist to accomplish three things: 1) to check orientation of the sections at an early stage, 2) to cut complete sections, and 3) to find the area or areas of pathology to cut. Furthermore, because diagnoses can be made from unstained sections, extra cuts for special stains may be ordered in advance of routine staining. The dermato-pathology laboratory is able, therefore, to produce slides of better quality and diagnoses more accurately and quickly.
mesh_terms: D006652:Histological Techniques; D006801:Humans; D008853:Microscopy / Q000379:methods*; D012871:Skin Diseases / Q000473:pathology*; D013194:Staining and Labeling / Q000379:methods