The Boston chapter of the Association of Health Care Journalists is back in business, and we’re inviting you to a panel discussion and reception with key members of the team that separated 22-month-old conjoined twins at Massachusetts General Hospital, knowing one would almost certainly die. The case raised a host of surgical and ethical challenges that Dr. Allan M. Goldstein, surgeon-in-chief at MassGeneral Hospital for Children, Dr. Brian M. Cummings, chair of the hospital’s Pediatric Ethics Committee, and Dr. Oscar J. Benavidez, chief of pediatric/congenital cardiology, will discuss.