According to a Richmond County sheriff's report, the 37-year-old victim said she was in the 400 block of Greene Street between 2 and 3 a.m. when a man walked up behind her, grabbed her around the neck, pressed a gun against her neck and told her not to move.
The victim said the man took $120 from her and then raped and sodomized her.
The woman said she was eventually able to remove a knife from her pants and cut the assailant across the left side of his face.
The victim said she then fled west on Greene Street.
The sheriff office was notified of the incident Friday morning by a nurse in University Hospitals emergency room, the report said.
The assailant was described as black, in his mid-40s, about 5 feet 6 inches tall and weighing about 165 pounds. He was wearing black pants, a black shirt with spots of gold-color trim and a baseball cap turned backward.
The victim said she had consumed an unknown amount of alcohol with her boyfriend before the incident.