title: [Microscopic pulmonary arteriovenous fistulas].
abstract: A case of pulmonary arterio-venous microfistula in a fifteen year old male is reported. He referred dyspnea and cyanosis for 3 and 2 years respectively. Physical examination was normal except for finger clubbing. Chest radiograph and EKG were also normal. Lung function tests showed hypoxemia due to an increase in veno-arterial shunt (Qs/Qt). Its localization was not apparent by routine studies such as phonocardiogram, echocardiogram, right heart catheterization and pulmonary angiogram. However, a contrast echocardiogram and selective occlusion of the right and left pulmonary arteries performed with a Dotter-Lucas catheter were suggestive of an intrapulmonary localization of the shunt. A lung biopsy confirmed the diagnosis.
mesh_terms: D000293:Adolescent; D001164:Arteriovenous Fistula / Q000175:diagnosis* / Q000473:pathology; D001706:Biopsy; D004452:Echocardiography; D004562:Electrocardiography; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging / Q000473:pathology; D008176:Lung Volume Measurements; D008297:Male; D011651:Pulmonary Artery; D011667:Pulmonary Veins; D011859:Radiography
vernacular_title: Fístulas arteriovenosas pulmonares microscópicas.