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Structural features of 59 progressive nevuses of the conjunctiva were studied. The proliferation of the epithelium and melanocytes is partially compensated by spontaneous regression of the nevus structures. The growth of a nevus is structurally similar to tumor growth, but the nevuses lack the melanocyte dysplasia, the main sign of malignant degeneration. The immune reactions are involved in the tissue restructuring of the growing nevus. Permanent foci of photoelastosis reflect the significance of ultraviolet exposure as a factor of risk of the nevuses progress.
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