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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.
Left Auricle. The left auricle, also known as the left atrial appendage (LAA), is a flap of heart wall on the anterior surface of the left atrium of the heart.eft Auricle. The left auricle, also known as the left atrial appendage (LAA), is a flap of heart wall on the anterior surface of the left atrium of the heart.