Blood cyst at junction between chordae tendineae of anterior mitral valve leaflet and papillary muscle in patients with partial endocardial cushion defect: one case report

Objective To explore the clinicopathological characteristics of blood cyst at junction between chordae tendineae of anterior mitral valve leaflet and papillary muscle so as to make an accurate diagnosis timely and elucidate its etiology. Methods Retrospective analyses were performed for the clinical data of a 10-year-old boy of partial endocardial cushion defect (PECD) with blood cyst at junction between chordae tendineae of anterior mitral valve leaflet and papillary muscle. Results The postoperative recovery was excellent.A re-examination of echocardiography revealed mild eccentric regurgitation and turbulent flow signals were detected during systolic period.Vena contracta was 3.0 mm.Arterial blood gas analysis showed oxygen partial pressure was 95 mmHg and transcutaneous oxygen saturation 99% during no oxygen supplementation.And there were postoperative improvements.During 6-month follow-ups, no obvious discomforts were found.Arterial blood gas analysis showed oxygen partial pressure was 98 mmHg and transcutaneous oxygen saturation 99% during no oxygen supplementation.Transesophageal echocardiography showed no abnormality of mitral valve area.Mild eccentric regurgitate and turbulent flow signals were detected during systolic period.Vena contracta was 1.5 mm and ejection fraction 70%. Conclusions Blood cyst of mitral valve equipment, especially at junction between chordae tendineae of anterior mitral valve leaflet and papillary muscle, is rare in clinical practice.Cyst and PECD should be treated simultaneously for a solitary cyst without any intracardiac lesions.Currently there is no consensus guideline.Symptomatic measures and regular observations are sufficient. Key words: Cyst; Congenital heart disease; Review