縦隔腫ようと鑑別が困難であった半奇静脈拡張の１例

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  • A case of dilatation of the hemiazygos vein preoperatively diagnosed as mediastinal tumor.

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We reported a rare case of dilatation of the hemiazygos vein preoperatively diagnosed as posterior mediastinal tumor. A 76-year-old womam was admitted to our hospital because of a chest CT scan showing a mass shadow of the posterior mediastunum. We suspected a posterior mediastinal tumor like neurogenic one by chest MRI and so on. Therefore, we performed thoracotomy and Intraoperative findings revealed that the hemiazygos vein was dilated in about 50 × 30 × 25 mm beside the descending aorta and the thoracic vertebral body. The wall of the dilated hemiazygos vein was hard, there was no danger of rupture and no thrombus in the dilated hemiazygos vein, and so we did not resect it. Aneurysm of the azygos vein preoperatively diagnosed as posterior mediastinal tumor sometimes is reported, but we think that a case of dilatation of the hemiazygos vein regardless of the abscence of underlyng disease like cirrhosis of the liver, anomalies of the inferior vena cava and so on is very rare.

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