Several adults were there, including Jimmy Savile who, like the others, was wearing a robe and a mask.
"She recognised him because of his distinctive voice and the fact that his blond hair was protruding from the side of the mask. He was not the leader but he was seen as important because of his fame.
"She was molested, raped and beaten and heard words that sounded like 'Ave Satanas', a Latinised version of 'Hail Satan', being chanted. There was no mention of any other child being there and she cannot remember how long the attack lasted but she was left extremely frightened and shaken."
Savile was a volunteer porter and fundraiser at the hospital between 1965 and 1988 and had his own quarters there.
Five years after the hospital attack, he abused a second victim during another black mass ceremony held at a house in a wealthy London street.
The woman was 21 at the time and was made to attend an orgy, which later took on a darker twist.
Dr Sinason, director of the Clinic for Dissociative Studies in London, said: "A second victim approached me in 1993. She said she had been 'lent out' as a supposedly consenting prostituted woman at a party in a London house in 1980.
“The first part of the evening started off with an orgy but half-way through some of the participants left.
"Along with other young women, the victim was shepherded to wait in another room before being brought back to find Savile in a master of ceremonies kind of role with a group wearing robes and masks. She too heard Latin chanting and instantly recognised satanist regalia. Although the girl was a young adult, who was above the age of consent, she had suffered a history of sexual abuse and was extremely vulnerable."
Both victims contacted Dr Sinason, who is president of the Institute of Psychotherapy and Disability, while she was involved in a Department of Health-funded study into sexual abuse committed during rituals and religious ceremonies. She said: "Both these witnesses did speak to police at the time but were vulnerable witnesses and on encountering any surprise or shock did not dare to give all the details."
The police took no action.
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Jimmy Savile was part of satanic ring