A pulmonary angiogram is useful for diagnosing which of the following?

A pulmonary angiogram is a diagnostic imaging procedure that is specifically designed to visualize the blood vessels of the lungs. This type of angiogram uses contrast material injected into the pulmonary arteries and imaging techniques, often fluoroscopy or computed tomography, to create detailed images of these vessels.

The utility of a pulmonary angiogram extends to various vascular concerns within the pulmonary system. It is adept at identifying congenital narrowing of the pulmonary vessels, where visualization can reveal abnormalities in blood flow and vessel diameter. Similarly, it plays a crucial role in diagnosing arteriovenous (AV) malformations of the lung, which are abnormal connections between arteries and veins that can disrupt normal pulmonary circulation. Moreover, a pulmonary angiogram is particularly effective in detecting pulmonary artery aneurysms, which are localized dilations of these arteries that can lead to serious complications if not identified and treated.

Given this broad spectrum of applications in diagnosing various conditions involving the pulmonary vasculature, it is clear that a pulmonary angiogram serves an important purpose in all three scenarios presented. This comprehensive diagnostic capability is why the correct response encompasses all the listed conditions.