Mitral valve prolapse

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What Wikipedia says

Mitral valve prolapse (MVP) is a valvular heart disease characterized by the displacement of an abnormally thickened mitral valve leaflet into the left atrium during systole. It is the primary form of myxomatous degeneration of the valve. There are various types of MVP, broadly classified as classic and nonclassic.

Excerpt from the Wikipedia article “Mitral valve prolapse”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Nephron, CC BY-SA 3.0, via Wikimedia Commons.