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Representative images of fresh interatrial shunt situated within the boundaries of the fossa ovalis across all timepoints (right atrial view). (a) Acute specimen shows the orifice edges appear rounded and expose the acutely sectioned tissue. (b) Thirty-day chronic shows surfaces of the shunt orifice edge and neighboring tissue appear smooth and glistening. (c) Sixty-day chronic shows a circular to mildly oval orifice with smooth edges.
