A 5-year-old, 7.9 kg castrated male Miniature Dachsund presented with heart enlargement on radiography. The dog was asymptomatic. Echocardiography revealed a tubular structure running along the posterior wall of the left atrium and connecting to the right atrium on the caudal side of the left atrium and annulus, which was presumed to be a dilated coronary sinus. After confirming a shunt between the left atrium and coronary sinus by cardiovascular catheterization, an unroofed coronary sinus was diagnosed. Open-heart surgery using cardiopulmonary bypass was performed through left atriotomy. The defect between the left atrium and the coronary sinus was closed by suturing. The cardiac enlargement improved after surgery. The dog was still alive 1227 days after surgery without clinical signs.

一只 5 岁、7.9 公斤重的雄性迷你腊肠犬在 X 光检查中发现心脏增大。这只狗没有出现症状。超声心动图显示，左心房后壁有一个管状结构，在左心房和瓣环的尾侧与右心房相连，推测为扩张的冠状窦。通过心血管导管插入术确认左心房和冠状窦之间存在分流后，诊断为无顶冠状窦。通过左心房切开术进行体外循环心脏直视手术。通过缝合闭合左心房和冠状窦之间的缺损。手术后心脏扩大情况有所改善。手术后 1227 天，这只狗仍然活着，没有任何临床症状。