The atlas describes the morphology of general pathological processes and diseases at different levels - from organ to ultrastructural. Macroscopic organ changes and microscopic tissue and cell changes detected in a light microscope are represented in color, and ultrastructural changes in black and white patterns. At the same time, most modern methods of morphological research were used: anatomy, histology and histochemistry, polarization, luminescence and electron microscopy, electronic histochemistry and electronic autoradiography.