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A 53-year-old male with fever and chest pain lasting more than 1 week is seen at the family practice and referred for diagnostic imaging. Chest X-ray (erect PA) is reported as otherwise normal. The attached erect CXR indicates the right pulmonary artery (RPA) and the left pulmonary artery. Based on this erect PA CXR, which of the following indicate the normal flow distribution from the pulmonary arteries to the ipsilateral pulmonary field (central versus periphery)? All of blood vessels everywhere in lung are bigger than normal Central vessels appear too large for size of peripheral vessels that come from them. Lower lobe vessels equal in size to upper lobe vessels Tapering of vessels from central to periphery. Upper lobe vessels larger than lower lobe vessels (cephalization)
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