Subdivided left atrium mimicking a cardiac tumor.
We describe a 25-year-old man with a subdivided left atrium. The lesion was misdiagnosed preoperatively as a cardiac tumor because echocardiographic and magnetic resonance imaging revealed a solid mass arising from the posterior wall of the left atrium. Cardiac surgery revealed a small accessory chamber draining the two left pulmonary veins. No membranous structure was evident between the chamber and the left atrium. The solid mass identified noninvasively was a hypertrophic muscle which formed a wall of the accessory chamber.
Shimaya
K
K
Department of Cardiology, Yokohama National Hospital, Japan.
Kurihashi
A
A
Tanaka
N
N
Higashidate
M
M
D000328:Adult; D006328:Cardiac Catheterization; D006348:Cardiac Surgical Procedures; D003937:Diagnosis, Differential; D017548:Echocardiography, Transesophageal; D006325:Heart Atria / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D006330:Heart Defects, Congenital / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D006338:Heart Neoplasms / Q000150:complications / Q000175:diagnosis*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male