This five-part review focuses on selected nonneoplastic diseases of th
e aorta and pulmonary trunk. Because many more diseases affect the aor
ta compared with the pulmonary trunk and right and left main pulmonary
arteries, most of this review will be devoted to disorders of the aor
ta. Part IV of the series discusses cystic medial degeneration, trauma
. and congenital diseases of the aorta.