ABSTRACT
Agenesia da veia cava inferior é uma malformação rara. Sua causa mais comum é a disgenesia durante a embriogênese, mas também pode estar relacionada a trombose intrauterina ou perinatal. Normalmente é assintomática, em associação, ou não, com outras malformações congênitas, e pode cursar com maior risco de insuficiência venosa crônica e trombose venosa profunda, especialmente em jovens. Seu diagnóstico frequentemente é acidental, durante cirurgias abdominais ou procedimentos radiológicos. Relatamos cinco casos de agenesia da veia cava inferior detectada durante procedimentos eletrofisiológicos.
Agenesis of the inferior vena cava is a rare malformation. Its most common cause is dysgenesis during embryogenesis, but it may also be related to intrauterine or perinatal thrombosis. It is usually asymptomatic, associated or not with other congenital malformations and may be related to increased risk of chronic venous insufficiency and deep vein thrombosis, especially in young individuals. Diagnosis is often incidental, during abdominal surgery or radiological procedures. We reported five cases of agenesis of the inferior vena cava detected during electrophysiological procedures.
Subject(s)
Humans , Male , Female , Cardiovascular Abnormalities/complications , Cardiovascular Abnormalities/diagnosis , Electrophysiology/methods , Vena Cava, Inferior/cytologyABSTRACT
The aim of the present study was to determine the most common origin of the azygos vein. Thirty cadavers male and female, white and non-white adult individuals of different ages fixed in 10 percent formaldehyde and dissected. All cadavers had an undisclosed clinical death and were donated to the Universidade Estadual de Ciências da Saúde de Alagoa s, Brazil. Eleven different formations were found. The right subcostal vein was was only observed in 13 cases (43.33 percent); the azygos vein was formed by the confluence of the right subcostal and right ascending lumbar vein in three cases (10 percent); by the right subcostal vein with a contribution from the inferior vena cava (IVC) in three cases (10 percent); by the right subcostal with contribution from IVC and right ascending lumbar vein in three cases (10 percent); by the right and left subcostal veins in two cases (6.66 percent); by the right and left subcostal veins and contribution from the IVC in one case (3.33 percent); by the right and left subcostal veins and left accessory renal vein in one case (3.33 percent); by the left renal vein in one case (3.33 percent); by the right subcostal and left gonadal veins with contribution from the IVC in one case (3.33 percent); by the right subcostal and left renal veins in one case (3.33 percent); and composed by the continuation of the 11th posterior intercostal vein in one case (3.33 percent). Based on the results, the right subcostal vein was the only structure with a significant presence in the formation of the azygos vein.
El objetivo del estudio fue verificar cual es la disposición más frecuente del origen de la vena ácigos. Fueron disecados 30 cadáveres de individuos adultos, de ambos sexos, de diferentes grupos étnicos, fijados en formaldehído al 10 por ciento, donados a la Universidade Estadual de Ciencias da Saúde de Alagoas. Se encontraron 11 formaciones diferentes. En 13 casos (43,33 por ciento) se observó sólo la vena subcostal derecha; en 3 casos (10 por ciento) la vena ácigos estaba formada por la confluencia de las venas subcostal derecha y lumbar ascendente derecha; en 3 casos (10 por ciento) formado por las venas subcostal derecha y una contribución de la vena cava inferior VCI; en 3 casos (10 por ciento) por las venas subcostal derecha y contribución de la VCI y lumbar ascendente derecha; 2 casos (6,66 por ciento) por las venas subcostales derecha e izquierda; en 1 caso (3,33 por ciento) por las venas subcostal derecha, izquierda y contribución de la VCI; en 1 caso (3,33 por ciento) por las venas subcostal derecha e izquierda y renal accesoria izquierda; en 1 caso (3,33 por ciento) por la vena renal izquierda; en1 caso (3,33 por ciento) por las venas subcostal derecha, gonadal izquierda y contribución de la VCI; en 1 caso (3,33 por ciento) por las venas subcostal derecha y renal izquierda y en 1 caso (3,33 por ciento) por la continuación de la 11 vena intercostal posterior. Con base en los resultados podemos concluir que la vena subcostal derecha fue la única estructura con presencia significativa en la formación de la vena ácigos.