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Lipomatous hypertrophy of the interatrial septum is a pathologic, not an anatomic diagnosis.

Kevin R AnJagdish ButanyRobert J Cusimano
Published in: Journal of cardiac surgery (2020)
On rare occasions, LHIS can arise from outside the interatrial septum. An LHIS can be differentiated from a lipoma by the presence of entrapped cardiac myocytes in LHIS, making it a pathological, rather than an anatomic, diagnosis.
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