Would a contrast-enhanced ct pulmonary angiogram also show lesions, abnormalities, masses, nodes, etc. of the lung or does it only show the blood vessels? (basically, does it provide more or less information than regular chest ct?)

Depends on how obtai: To perform a CT pulmonary angiogram, you actually have to get scanned twice - once without dye, once with. A "regular" chest CT is only performed once. So, you should get some information about the lungs itself (masses, nodes, lesions, etc.) from a pulmonary angiogram CT unless it was obtained improperly or under an unusual protocol. Note, also, that even a CT can miss small nodes, lesions, masses

It provides: More information than a non contrast chest CT. All of the things you mentioned can be evaluated.