A carcinoid tumor can cause lesions in the valves of the heart. These lesions can lead to a condition called carcinoid heart disease. This is a serious condition that occurs in people affected by an advanced carcinoid tumor and is likely the result of the excess amounts of vasoactive chemicals secreted by the tumor. Carcinoid heart disease usually starts in the valves of the right side of the heart and may lead to right side heart failure. In this case, patients are advised to undergo valve replacement surgery.

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