Study on 50 specimens of azygos venous system (Vietnamese cadavers) included 47 male, 3 female, aged 30-65 from 1998-2000 and clinical research in portal hypertension syndrome. Patterns, diameters, sub-diaphragmatic origins of the azygos system of vein were observed. The retroaortic anastomoses, connections to brachicephalic veins, esophageal veins also were noted. Discussing some hemodynamic patterns based on morphologic aspect and the future trend of study
Azygos Vein ; Hypertension ; anatomy & histology

Failure of normal embryogenesis may result in various anomalies of the inferior vena cava that can bereli-ably detected by computed tomography. Agenesis of the intrahepatic segment of the inferior vena cava withazygos continuation is a rare anomaly due to a complex developmental process of the inferior vena cava. Theauthors report a case in which this anomaly was diagnosed on computed tomography and confirmed by inferi-or venacavography.
Azygos Vein ; Embryonic Development ; Female ; Pregnancy ; Vena Cava, Inferior*

3 cases of azygos lobe were found during dissection at Chungnam National University of Korea in 2000 ~2001. All the azygos lobes located at the right upper lobe, and azygos fissures began from the upper anterior part of hilum, curved laterally and postieriorly around the apical portion of right lung toward the upper posterior part of hilum. Each azygos vein of 3 cases ran along the azygos fissure in its base, forming azygos arch, and ended into the superior vena cava at the level of 2nd costal cartilage. Bronchopulmonary dissection revealed the B 1 a and B 1 b supplying the azygos lobe in all cases.
Azygos Vein ; Cartilage ; Chungcheongnam-do ; Korea ; Lung ; Vena Cava, Superior

BACKGROUND/AIMS: Differentiation of an extraluminal compression from a true subepithelial tumor (SET) in the esophagus by using endoscopy alone is often difficult. EUS is known as the best method for differentiating an extraluminal compression from a true SET. Extraluminal compression in the esophagus is occasionally observed, but its clinical significance has been rarely reported. Therefore, we aimed to evaluate the clinical significance of extraluminal compression in the esophagus according to the location of the lesion. MATERIALS AND METHODS: Sixty-one patients were diagnosed as having an extraluminal compression in the esophagus by using EUS between January 2006 and March 2014. Some patients underwent chest computed tomography for accurate diagnosis. RESULTS: The extraluminal compression was located at the mid-esophagus in 26 cases, lower esophagus in 22 cases, and upper esophagus in 13 cases. Of the 61 cases, 55 were caused by normal structures and 6 were caused by pathological lesions. The causes of the normal structures were the aorta, vertebra, trachea, left main bronchus, azygos vein, and diaphragm. The causes of the pathological lesions were engorged vessels and calcified lymph nodes. The posterior wall was the most frequent location of the extraluminal compression. However, the lesions in the anterior and right walls showed a higher frequency of pathological lesions than those in other sites. CONCLUSIONS: If the extraluminal compression is found in the anterior and right walls of the esophagus, more careful evaluation should be performed considering the high frequency of pathological lesions in the site.
Aorta ; Azygos Vein ; Bronchi ; Diagnosis ; Diaphragm ; Endoscopy ; Endosonography ; Esophagus* ; Humans ; Lymph Nodes ; Methods ; Spine ; Thorax ; Trachea

An azygos vein aneurysm is a very rare cause of a posterior mediastinal mass. Once the diagnosis has been confirmed, no treatment is usually required. However, the aneurysm can thrombose, and this may lead pulmonary thromboembolism, or the aneurysm may rupture. In these instances, the excision of the mass is recommended. Video-assisted thoracic surgery techniques have considerably improved. If it is necessary to remove the aneurysm, video-assisted thoracic surgery may be a good option for surgical treatment. We report a case of an aneurysm of the azygos arch that was successfully resected by video-assisted thoracic surgery.
Aneurysm ; Azygos Vein ; Mediastinum ; Pulmonary Embolism ; Rupture ; Thoracic Surgery, Video-Assisted

An azygos vein aneurysm is a very rare cause of a posterior mediastinal mass. Once the diagnosis has been confirmed, no treatment is usually required. However, the aneurysm can thrombose, and this may lead pulmonary thromboembolism, or the aneurysm may rupture. In these instances, the excision of the mass is recommended. Video-assisted thoracic surgery techniques have considerably improved. If it is necessary to remove the aneurysm, video-assisted thoracic surgery may be a good option for surgical treatment. We report a case of an aneurysm of the azygos arch that was successfully resected by video-assisted thoracic surgery.
Aneurysm ; Azygos Vein ; Mediastinum ; Pulmonary Embolism ; Rupture ; Thoracic Surgery, Video-Assisted

Malposition of the extracorporeal membrane oxygenation (ECMO) venous cannula in the azygos vein is not frequently reported. We hereby present such a case, which occurred in a neonate with right-sided congenital diaphragmatic hernia. Despite ECMO application, neither adequate flow nor sufficient oxygenation was achieved. On the cross-table lateral chest radiograph, the cannula tip was identified posterior to the heart silhouette, which implied malposition of the cannula in the azygos vein. After repositioning the cannula, the target flow and oxygenation were successfully achieved. When sufficient venous flow is not achieved, as in our case, clinicians should be alerted so they can identify the cannula tip location on lateral chest radiograph and confirm whether malposition in the azygos vein is the cause of the ineffective ECMO.
Azygos Vein* ; Catheters* ; Extracorporeal Membrane Oxygenation* ; Heart ; Hernias, Diaphragmatic, Congenital* ; Humans ; Infant, Newborn* ; Oxygen ; Radiography, Thoracic

Azygos vein aneurysm is a rare cause of mediastinal mass. Most cases present as an incidental finding on imaging modalities, but in few cases the thrombosis in the aneurysm leads to pulmonary thromboembolism, which may require surgical resection. We present a case where, for the first time, a case of a complicated azygos vein aneurysm was diagnosed in infancy, which required surgical resection.
Aneurysm* ; Azygos Vein* ; Humans ; Incidental Findings ; Infant* ; Mediastinal Diseases ; Pulmonary Embolism* ; Thrombosis

Azygos Vein ; injuries ; Humans ; Male ; Middle Aged ; Thoracic Injuries ; complications ; Wounds, Nonpenetrating ; complications

Malposition of the extracorporeal membrane oxygenation (ECMO) venous cannula in the azygos vein is not frequently reported. We hereby present such a case, which occurred in a neonate with right-sided congenital diaphragmatic hernia. Despite ECMO application, neither adequate flow nor sufficient oxygenation was achieved. On the cross-table lateral chest radiograph, the cannula tip was identified posterior to the heart silhouette, which implied malposition of the cannula in the azygos vein. After repositioning the cannula, the target flow and oxygenation were successfully achieved. When sufficient venous flow is not achieved, as in our case, clinicians should be alerted so they can identify the cannula tip location on lateral chest radiograph and confirm whether malposition in the azygos vein is the cause of the ineffective ECMO.
Azygos Vein ; Catheters ; Extracorporeal Membrane Oxygenation ; Heart ; Hernias, Diaphragmatic, Congenital ; Humans ; Infant, Newborn ; Oxygen ; Radiography, Thoracic