DETROIT — A Michigan doctor accused of sexually abusing gymnasts was sued Tuesday by 18 women and girls, the latest legal action over alleged assaults, mostly at his clinic at Michigan State University. The lawsuit against Dr. Larry Nassar, Michigan State, USA Gymnastics and a Lansing-area gymnastics club was filed in federal court in western Michigan. It makes claims of civil rights violations, discrimination and negligence. The Associated Press usually doesn’t name people who allege sexual abuse, but one of the plaintiffs, Rachael Denhollander, 32, of Louisville, Kentucky, talked publicly about the lawsuit. She said she was assaulted by Nassar while seeing him for wrist and back injuries at age 15 in 2000.