The medical board, formed to conduct medical test on an alleged rape victim in Noakhali's Kabirhat, did not find any evidence of gang rape.
The test report was sent to the office of Noakhali superintendent of police on Wednesday, said Dr Khalil Ullah, superintendent of Noakhali General Hospital.
A mother of three was allegedly gang-raped in the early hours of Saturday.
Hearing the test results, the victim expressed frustration and said there were still marks of torture on her body and she could not move properly.
Meanwhile, detectives yesterday arrested another accused Jamal Uddin, 29, from Cumilla's Chauddagram upazila.
Zakir Hossain, investigation officer of the case, said they arrested Jamal following the confessional statement of Zakir Hossain Jahir, the prime accused in the case.
In the statement, Jahir mentioned the names of four other people, including Jamal, who were involved in the rape.
With Jamal, police arrested all the four.
According to the victim, seven men broke into her village home around 1:30am on Saturday while she and her three children were asleep.
Holding the children hostage at knifepoint, the men tied her hands and legs and three of them raped her. They also took away valuables from her house, she alleged.