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Best Answer: An enlarged left atrium means simply that the atrium that pumps blood in the ventricle that pumps blood to the rest of the body is larger than it should be, the seriousness depends on the size of the enlargement, a small enlargement usually won't pose any noticable problems, however, a larger deviation from normal size can lead to problems ranging from electrical dissarray such as atrial fibrillation to stroke, due to blood pooling in the atrium.
The left atrium forms the dorsocaudal section of the base of the heart and is similar to the right atrium in structure and shape. It receives oxygenated blood from the lungs via the pulmonary veins. Blood passes from the left atrium to the left ventricle through the bicuspid or left atrioventricular valve. The left atrium lies under the tracheal bifurcation and enlargement of this area of the heart can cause breathing difficulties.