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Excess accumulation of calcium (mitral annular calcification) and of fat (lipomatosis of the posterior <jats:styled-content style=\"fixed-case\">AV<\/jats:styled-content> groove) may also occur in this region. Masses (tumors or thrombus) arising from the floor of the left atrium or extrinsic to it (hiatal hernia, lymph nodes) may occupy the posterior <jats:styled-content style=\"fixed-case\">AV<\/jats:styled-content> groove. Abnormalities of the left ventricle, including aneurysms and pseudoaneurysms may present as masses in the posterior <jats:styled-content style=\"fixed-case\">AV<\/jats:styled-content> groove. 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