Arc-shaped scotoma (lat. struma arcuata) is a pathological process characterized by the appearance in the projection of the body of the sternum and parasternal region of the so-called “arc-shaped lambda-shaped” defects in the form of linear shadows. The process does not develop as a result of irritation by sunlight - shady scars contain from 2 to 6-8 rows of cytoplasm of cells with karyolysis of nuclear chromatin of a degenerative nature with signs of “golden” wrinkling. Those. the disease may occur due to an imbalance of thyroid hormones