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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.
Dear Doc, I've written before regarding a CT scan that showed a sligthly enlarged inferior vena cava, right atrium, top normal liver and prominent splenic vein. An echo confirmed the slightly enlarged right atrium, and indicated that my left ventricle and atrium have also enlarged by approximately 25% since the last echo 6 months ago. The echo also indicated a slight increase in mitral valve regurgitation.