Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of PA (posteroanterior)
Medically reviewed by Min Clinic Staff | Updated: January 2026
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.