MEGAESÓFAGO POR PERSISTENCIA DEL CUARTO ARCO AÓRTICO DERECHO EN UN CANINO. MANEJO CLÍNICO Y QUIRÚRGICO
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Resumen
Los defectos congénitos de los anillos vasculares en caninos, producto de alteraciones en la embriogénesis, pueden comprometer el libre tránsito del bolo alimenticio al comprimir el esófago. La persistencia del cuarto arco aórtico derecho potencialmente puede generar una compresión esofágica de tal magnitud que los alimentos sólidos son regurgitados al poco tiempo de ingeridos, retardando el crecimiento y comprometiendo la vida del paciente. Anterior a la obstrucción se genera una dilatación esofágica producto de la acumulación de alimento, lo que puede afectar irreversiblemente la actividad motriz del órgano. La resolución de esta alteración debe efectuarse tan pronto como sea posible para evitar graves consecuencias; sin embargo, es necesario precisar el diagnóstico al descartar algunas posibles causas que cursen con una clínica similar. En el caso presentado, las evaluaciones radiográficas simples y de contraste permitieron orientar el diagnóstico con gran precisión, aunque fue necesario efectuar una toracotomía exploratoria confirmatoria. El proceso quirúrgico realizado para corregir la persistencia del anillo vascular mostró ser altamente efectivo al liberar la constricción y aliviar la signología clínica del paciente; no obstante, controles radiográficos post quirúrgicos revelaron persistencia de la dilatación esofágica, aunque en ausencia de signos clínicos de relevancia.
Megaoesophagus Asociated with Persistent Right Aortic Arch in a Dog. Clinical and Surgical Management
ABSTRACT
Canines’ congenital vascular ring anomalies due to alterations in the embriogenesis process might compromise the passage of food from the mouth to the stomach, due to esophageal compression. The persistent right aortic arch may compress the esophagus hard enough so the food that has been swallowed backs up into the mouth in a short time; it delays normal growth and jeopardizes the patient’s life. The esophagus widens prior to constriction due to the accumulation of food and affects its motor activity. This pathology should be corrected as soon as possible to avoid complications; however, an accurate and specific diagnosis in order to discard other diseases is required. In this report although a thoracic exploration was necessary, the radiographic evaluation (single and contrast) was the guideline. The surgical procedure to correct the persistent right aortic arch proved to be highly effective when the constriction of the esophagus was eliminated. Radiographic post surgical evaluation showed an important degree of esophagus dilatation without relevant clinical signs.
Megaoesophagus Asociated with Persistent Right Aortic Arch in a Dog. Clinical and Surgical Management
ABSTRACT
Canines’ congenital vascular ring anomalies due to alterations in the embriogenesis process might compromise the passage of food from the mouth to the stomach, due to esophageal compression. The persistent right aortic arch may compress the esophagus hard enough so the food that has been swallowed backs up into the mouth in a short time; it delays normal growth and jeopardizes the patient’s life. The esophagus widens prior to constriction due to the accumulation of food and affects its motor activity. This pathology should be corrected as soon as possible to avoid complications; however, an accurate and specific diagnosis in order to discard other diseases is required. In this report although a thoracic exploration was necessary, the radiographic evaluation (single and contrast) was the guideline. The surgical procedure to correct the persistent right aortic arch proved to be highly effective when the constriction of the esophagus was eliminated. Radiographic post surgical evaluation showed an important degree of esophagus dilatation without relevant clinical signs.
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