Patent Foramen Ovale (PFO)
A PFO is a defect in the septum wall between the two upper chambers of the heart. The defect is an incomplete closure of the septum that results in a flap or valve-like opening in the septal wall.

Patent Foramen Ovale (PFO)
A PFO is a defect in the septum wall between the two upper chambers of the heart. The defect is an incomplete closure of the septum that results in a flap or valve-like opening in the septal wall.