Sporadic arteriosclerosis of the aorta, with or without pulmonary ossification, occurred in seven cattle from slaughter-houses and farms. Aortic walls were thickened, and had many white or yellow mineralized plaques on the intimal surface. The lungs did not collapse, were firm, gritty and crepitant on palpation, and sponge-like in appearance on cross section. Microscopically, the aortas had mineral deposits in the tunica intima and media, varying in size and structure and surrounded by fibrous tissue. Lungs in four cases contained multiple spicules of metaplastic bone within alveolar walls. This disease was associated with high doses of vitamin D(3) in three cows and one heifer.
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