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A localized hypertrophy of the subaortic segment of the ventricular septum has been frequently described in elderly persons, and variously termed subaortic ventricular septal bulge (VSB), sigmoid-shaped septum, localized or discrete upper septal hypertrophy. [ORCID:0000-0001-5835-5515, PMID:25129067, PMID:9203495]
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