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At one point during the treatment, Moore said, Nassar used acupuncture needles in his pubic area and partially exposed his genitals while another of Nassar's victims was in the room. Nassar allegedly asked the girl if she had ever seen a male body part before.
"I wasn't a dumb kid. I knew, kind of, what medical practices were, and that one was out of the ordinary," Moore told "Today." "Coming out of the treatment, I felt very uncomfortable."
It wasn't until allegations started surfacing against Nassar that Moore decided to search for any medical explanation for the experience.
"Having found nothing, I kind of freaked out," Moore said. "It was just very shocking."
Nassar has been sentenced to spend the rest of his life in prison for molesting young girls under the guise of treatment. While Nassar only pleaded guilty to abusing seven people, over 230 have leveled accusations against him, including Moore's sister, Kamerin.
"Me and my sister shouldn't be able to relate over the fact that we've both been abused," Moore told "Today." "That's just really sickening to me that he would violate a trust like that, and the things that he did were just awful."
USA Gymnastics would not comment specifically on the federal lawsuit, but said in a statement, "We are very sorry that any athlete has been hurt by the despicable crimes of Larry Nassar," adding that the organization was determined not to let anything similar happen again.