PMID: 9538621Apr 16, 1998Paper

A case of the double mitral valve orifices

Kaibogaku zasshi. Journal of anatomy
Y ObaraM Horiguchi

Abstract

In 1996 student course of gross anatomy dissection at Iwate Medical University School of Medicine, a case of the double mitral valve orifices was found in a heart of a 73-year-old male cadaver who died of acute pneumonia. No other congenital anomalies were detected in this heart. There was no prior history of heart disease. The left atrioventricular ostium was an oval with a long axis of 4 cm and a short axis of 2.5 cm. There were double mitral valve orifices, main and accessory (Fig. 1). The main orifice situated left ventrally with a long axis of 2.5 cm and a short axis of 1.7 cm, had a larger cleft. The accessory orifice situated right dorsally with a long axis of 2.5 cm and a short axis of 1.2 cm, had a smaller cleft. There was a bridge-like valvular leaflet between the two clefts (Fig. 1). Disregarding small incisions, both the main and the accessory mitral valves had two cusps, anterior and posterior. The anterior and posterior cusps of the main and accessory valves were continuous and considered to be homologous with the anterior and posterior cusps of the normal mitral valve. In other wards, this double mitral valve orifices was appeared to be formed by bridging the cleft between the anterior and posterior cusps of the ...Continue Reading

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