Amie Miller, 15, was taken to Basildon Hospital A&E in November 2008 after suffering headaches while studying for her GCSEs.
A jury returned a narrative verdict, saying that the medics had seriously failed to meet Amie's needs by failing to carry out basic checks, administering inappropriate treatment and failing to properly communicate with one another.
Speaking afterwards, Amie's family told how she was a promising student who had dreamed of becoming a paediatrician.
More top news
The mother of missing RAF Serviceman Corrie McKeague says she "now knows" that her son is not in a Cambridgeshire landfill.
Officers say they are 'content' Corrie is not in the landfill areas which have now been searched.
ITV News Anglia was given access to police teams trying to curb the supply of class A drugs and limit the damage they do.