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Regarding the pulmonary arteries, which of the following are true?
a) The upper lobe pulmonary veins lie lateral to the upper lobe arteries
on chest radiography
b) On a lateral chest radiograph, the right pulmonary artery lies posterosuperior
to the Carina
c) The pulmonary artery systolic pressure may be estimated by Doppler echocardiography
d) Pulmonary arteriovenous malformations are rarely multiple
e) A pulmonary varix is commonly found in the upper lobes

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