22 topics with concise breakdowns: definitions, key facts, and classroom questions.
Dystrophies (metabolic tissue degenerations) are the structural basis of cellular and tissue metabolism disorders. In this section, we examine how metabolic breakdowns alter organ morphology, leading to the accumulation or depletion of substances where they should not be.
The material covers all key types of dystrophies: parenchymal (protein, lipid, carbohydrate) and stromal-vascular. Special attention is paid to endogenous pigmentations (hemoglobinogenic and proteinogenic pigments), including hemosiderosis, hemochromatosis, porphyrias, and melanin metabolism disorders. Mineral dystrophies (calcium, copper, sodium, and potassium metabolism), the pathogenesis and types of edema, nucleoprotein metabolism disorders, and the mechanisms of stone formation are also detailed.
Practical classes and exams most rigorously test the morphogenesis of dystrophies (infiltration, decomposition, transformation, aberrant synthesis), the differences between generalized and local hemosiderosis, and the macroscopic appearance of organs—such as the "tiger heart" in myocardial fatty degeneration or the "nutmeg liver".
These are storage diseases. They develop in hereditary dystrophies when, due to a genetic enzyme defect (enzymopathy), metabolic products are not metabolized but are instead stored in tissues.
What is the difference between reversible cloudy swelling and hyaline-droplet dystrophy?
Cloudy swelling (granular dystrophy) is a reversible manifestation of functional cellular strain with the accumulation of fine protein granules. Hyaline-droplet dystrophy is an irreversible or extremely severe process involving membrane destruction and the coagulation of proteins into large droplets.
What is phanerosis in parenchymal dystrophies?
Phanerosis is a mechanism of decomposition characterized by the breakdown of masked (bound) lipoprotein complexes within intracellular structures and membranes, leading to the appearance of free neutral fats in the cytoplasm.
How does labile glycogen differ from stable glycogen?
Labile glycogen is stored in the liver and skeletal muscles and is easily used up to meet energy demands. Stable glycogen is part of the heart's conduction system, nervous tissue, and cartilage, maintaining a constant level.
What is the fundamental difference between mucoid and fibrinoid swelling?
Mucoid swelling is a reversible process in which collagen bundles retain their structure and the tissue exhibits pronounced metachromasia. Fibrinoid swelling is irreversible; the fibers are completely destroyed, metachromasia disappears, and fibrin invariably appears in the tissue.
What is the principal difference between hemosiderosis and hemochromatosis?
In hemosiderosis, the pigment simply accumulates within cells, typically without disrupting their function. Hemochromatosis, by contrast, is always accompanied by tissue damage, parenchymal cell death, decreased organ function, and the development of sclerosis.
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