Persistent abdominal pain and unexplained weight loss marked the beginning of what seemed like a life-or-death journey that the 67-year-old woman could never have anticipated. However, thanks to a well-structured treatment strategy and advanced surgical techniques, doctors at Vinmec Central Park (Ho Chi Minh City) successfully performed a major surgery to completely remove a malignant ovarian tumor complicated by a colonic fistula – a highly dangerous condition once considered "untreatable."