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.
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.