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Intracardiac blood cysts are rare congenital malformations most commonly located in the endocardium of semilunar or atrioventricular valves. They are predominantly seen in infants, especially below 2 months of age, and disappear spontaneously in the first 6 months of life making the detection of blood cysts a rare finding in the adult population. Although most patients are asymptomatic, they may occasionally present with obstruction, valvular dysfunction, or embolism. Herein, we present a 2.5‐year‐old female patient, who was successfully treated with surgical excision of an intracardiac blood cyst causing mild‐to‐moderate mitral regurgitation and obstruction. [ABSTRACT FROM AUTHOR]

Cardiac blood cysts are confirmed by autopsies in stillbirths but rarely detected in adults. Although cardiac blood cysts are common in newborns, they disappear within a few months after birth. These cysts are blood‐filled diverticula surrounded by endothelium. Their possible etiology is invaginations of atrial endothelium into the stroma of atrioventricular valves. Most blood cysts originate from the left side of the heart and are located on the atrioventricular valves. Complication is followed in very little cases, such as embolic stroke, valvular dysfunction, and ventricular outflow system obstruction. The blood cysts leading to complications should be removed surgically. [ABSTRACT FROM AUTHOR]

Intracardiac blood cysts are thin-walled cysts, lined by flattened, cobblestone-shaped epithelium, and filled with nonorganized blood. During autopsy, they are found on cardiac valves in approximately 50% of infants below the age of 2 months and are rarely found after the age of 2 years. We report a rare case of blood cyst attached to the mitral valve and a possible cause of an embolic stroke. [ABSTRACT FROM AUTHOR]

We report a case of giant blood cyst originating from the anterior mitral valve leaflet, which was discovered during a two-dimensional echocardiography examination performed for investigation of a systolic murmur in a 34-year-old healthy man. Three-dimensional microbubble-enhanced images showed a heart-shape appearance that may be pathognomonic for blood cyst of the mitral valve. [ABSTRACT FROM AUTHOR]