A mother has told of her shock after confidential information about her child was shared at a school assembly.
The incident happened at Brechin High School during an exam preparation slideshow to hundreds of pupils on Monday.
Personal details of about 50 pupils were revealed on slides detailing conditions including autism and ADHD.
Angus Council has launched an investigation into what it said was an "isolated incident."
The presentation covered how pupils can prepare for prelim exams in January.
It then detailed how exam arrangements for children with additional support needs would be different, and listed individual pupils.
The child's mother said: "You're just shocked, because these are teachers, they're educators.
"They do data protection training courses on a regular basis.
"In this age of confidentiality and data protection how would you think it was reasonable to do that?"
The parent said that the named pupils would "without a doubt" be affected by the incident.
She said: "I won't be leaving this here and I don't think it should just be swept under the carpet with an internal investigation.
"My concern now is how these vulnerable young people are going to be supported."
Angus Council said the school's head teacher was contacting the parents of the pupils whose details were shared.
A spokesman said the incident was "unacceptable" and should not have happened "under any circumstances."
He said: "We apologise for the obvious upset and concern this has caused, particularly to those young people whose details were shown.
"Inquiries are under way to establish the full circumstances of this isolated incident and whether any individual learning requires to be provided."
The council said the UK Information Commissioner had also been advised of the incident and "appropriate support" would be provided to the pupils affected.