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Subdivided left atrium mimicking a cardiac tumor.
K Shimaya1, A Kurihashi, N Tanaka
1Department of Cardiology, Yokohama National Hospital, Japan.
International Journal of Cardiology
|April 3, 1999
Summary
A rare case of a subdivided left atrium in a 25-year-old man was initially misdiagnosed as a cardiac tumor. Surgery revealed a hypertrophic muscle forming an accessory chamber, not a tumor.
Area of Science:
- Cardiology
- Congenital heart disease
- Cardiac imaging
Background:
- Subdivided left atrium is a rare congenital anomaly.
- Accurate preoperative diagnosis is crucial for appropriate management.
- Cardiac imaging modalities like echocardiography and MRI are vital for diagnosis.
Observation:
- A 25-year-old male presented with a lesion in the left atrium.
- Echocardiography and MRI suggested a solid mass, leading to a preoperative misdiagnosis of cardiac tumor.
- Surgical exploration revealed an accessory chamber draining the left pulmonary veins.
Findings:
- The 'cardiac tumor' was identified as a hypertrophic muscle forming the wall of an accessory chamber.
- No membranous structure was found between the accessory chamber and the main left atrium.
- This highlights a unique presentation of left atrial subdivision.
Implications:
- This case underscores the importance of considering rare congenital anomalies in differential diagnoses.
- Advanced cardiac imaging interpretation requires careful consideration of anatomical variations.
- Accurate diagnosis of left atrial subdivision prevents unnecessary surgical interventions for presumed tumors.