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AJR Am J Roentgenol. 2015 Dec;205(6):1322-5. doi: 10.2214/AJR.15.14301.

Main Pulmonary Artery-to-Ascending Aorta Diameter Ratio in Healthy Children on MDCT.

Author information

1
1 Department of Diagnostic Imaging, The Hospital for Sick Children, University of Toronto, ON, Canada.
2
2 Present address: Department of Radiology, Queensland X Ray, Mater Private Hospital, 21-37 Fulham Rd, Townsville, Queensland 4812, Australia.
3
3 Department of Paediatrics, The Hospital for Sick Children, University of Toronto, ON, Canada.

Abstract

OBJECTIVE:

This study was performed to ascertain whether the adult ratio of 1:1 of the diameter of the main pulmonary artery (MPA) to the diameter of the ascending aorta (AA) (referred to hereafter as the MPA-to-AA ratio) on MDCT is applicable to children.

MATERIALS AND METHODS:

Our hypothesis, which is based on experiential observation, is that the MPA-to-AA ratio would be higher than 1 in healthy children. A retrospective analysis of vessel calibers in a population of children without pulmonary hypertension who had undergone MDCT was performed.

RESULTS:

The MPA-to-AA ratio was statistically significantly higher in children of all ages than in adults. We would, therefore, submit that the normal MPA-to-AA ratio in children on MDCT is greater than 1 and closer to 1.09.

CONCLUSION:

The demonstration of an MPA segment that is slightly larger than the AA in children undergoing MDCT should not suggest a diagnosis of pulmonary arterial hypertension.

KEYWORDS:

CT; pediatric; pulmonary hypertension

PMID:
26587940
DOI:
10.2214/AJR.15.14301
[Indexed for MEDLINE]

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