Myxedema Coma and Acute Hepatopathy in a Dog with Severe Atherosclerosis

Figure 5

Histopathology of the right thyroid gland (hematoxylin and eosin stain, 10x). Histologically normal parathyroid tissue is seen in the top left. No thyroid follicular epithelium is noted (severe atrophy/loss). The tunica media of this artery is markedly expanded by foam cells, cholesterol clefts, and eosinophilic proteinaceous debris. The tunica adventitia is expanded by fibrous connective tissue, and there is mild lymphoplasmacytic infiltration within the vessel wall and extending into the adjacent fibrofatty tissue.