Staff at the Queen Elizabeth Hospital in Birmingham posted an emotional video showing him receive the trophy, which has been viewed thousands of times.
“As you can see from his face, he was just delighted with it,” he added.
Ben’s father Sam Williams, from Kings Norton, told the Independent: “What the staff in the radiology department did for him on his last day of treatment was just so special.”
Rio Ferdinand, who has 81 caps for England, and has been commentating for the BBC during this year’s competition, also sent Ben a message of support.
The England captain said he will be on the players’ minds ahead of Saturday’s World Cup quarter-final against Sweden.
England star Harry Kane sent a message of support from Russia to a five-year-old boy who is battling a brain tumour.
Ben Williams was presented with a replica World Cup trophy to celebrate his bravery after six weeks of radiotherapy treatment.