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.
Found on http://www.medterms.com/script/main/art.asp?articlekey=4719
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