James Fletcher, aged 6, nearly died when his parents took him to York Hospital after he had banged his head.
The staff at the hospital had diagnosed a fractured skull and blood clot as a stomach bug.
James was admitted for observation but not given an X-ray or a CT scan because of "strict guidelines".
He was then sent home but later rushed to Leeds for surgery to remove the clot and is now recovering at home. Stephen Fletch, James dad has made an official complaint to the hospital after what he called "three days of hell." An inquiry has been launched.