how would you describe polina >> vivacious >> reporter: and then dr. sean levchuck donated his time and expertise to perform the minimally invasive surgery at st. francis hospital and heart center. >> at 9 years of age they should be worrying about, you know, having fun >> reporter: tonight, two days after that surgery, polina is having fun and smiling. >> i'm happy because my surgery, it's good. >> reporter: she and her mother expect to return home soon the war may not be over, but in at least one way her heart is no longer broken gabe gutierrez, nbc news, roslyn, new york. >> what a great moment that's "nightly news" for this friday. thank you for watching i'm lester holt. please take care of yourself and each other. good night >>> it is out of here! >>> welcome to nbc sports bay area, home of the authentic fan. a beautiful night for baseball