Michael P. D'Alessandro, M.D.
Peer Review Status: Internally Peer Reviewed
Due to a failure of division of the embryonic truncus arteriosus into the aorta and pulmonary artery. A single great artery leaves the heart and gives rise to the coronary, pulmonary, and systemic arterial circulation. The truncus stradles a high VSD and receives outflow from both ventricles. A truncal valve has 2-6 cusps, and usually is incompetent. Truncus is classified by the origin of the pulmonary artery:
For Type I truncus and Type II and Type III without pulmonary stenosis, increased pulmonary vasculature and cardiomegaly is seen due to biventricular and left atrial enlargement due to the left to right shunt and insufficiency of the truncus valve. It can resemble TGA on CXR, but note that 30% of truncus have a right arch while only 5% of TGA do.
See References Chapter.
Section Top | Title Page
Follow us on Twitter @pedseducation and @pedsimaging and Facebook @pedsimaging and Instagram @pedsimaging
Please send us comments by filling out our Comment Form.
All contents copyright © 1992-2016 Donna M. D'Alessandro, M.D. and Michael P. D'Alessandro, M.D. and the authors. All rights reserved.
"Virtual Pediatric Hospital", the Virtual Pediatric Hospital logo, and "A digital library of pediatric information" are all Trademarks of Donna M. D'Alessandro, M.D. and Michael P. D'Alessandro, M.D.
Virtual Pediatric Hospital is funded in whole by Donna M. D'Alessandro, M.D. and Michael P. D'Alessandro, M.D. Advertising is not accepted.
Your personal information remains confidential and is not sold, leased, or given to any third party be they reliable or not.
The information contained in Virtual Pediatric Hospital is not a substitute for the medical care and advice of your physician. There may be variations in treatment that your physician may recommend based on individual facts and circumstances.