The endodontist is the one who did this scan. He is recommending an apicoectomy done by an oral surgeon. I was interested in others' opinions because I didn't feel completely comfortable with his determination. I'm not a doctor, but it looked to me like my canal wasn't completely filled due to a curve. I was a bit surprised that the endo was recommending an apicoectomy and not retreatment as the first option.
Go back to your dentist/endodontist and see what they recommend. Could be a variety of treatments and antibiotics to help clear up the infection. An extraction may be necessary.