PA (posteroanterior)

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Medical Definition of PA (posteroanterior)

PA (posteroanterior): In anatomy, PA stands for posteroanterior: from back-to-front. For example, a PA X-ray of the chest is taken from back-to-front.

PA in this respect is the opposite of AP which stands for anteroposterior: from front-to-back.


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Reviewed on 6/9/2016

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