A former patient of a disgraced surgeon interrupted the SNP's independence convention to call for a public investigation.
Theresa Mallett, 61, claimed that after a sciatica procedure at Ninewells Hospital in Dundee went wrong, she sustained injuries that have changed her life.
Prof. Sam Eljamel, a former doctor for NHS Tayside, is suspected of harming hundreds of patients.
First Minister Humza Yousaf got up from his seat to address Ms. Mallett.
A damning report released the previous year exposed shortcomings in how NHS Tayside managed the neurosurgeon who injured patients for years.
And in April, Health Secretary Michael Matheson announced the start of an impartial investigation into NHS Tayside in connection with the scandal.
Ms. Mallett from Glenrothes, a former lifelong SNP supporter, told Mr. Yousaf that she would lose faith in the party unless there was a thorough public investigation.
The grandmother said this after the event at Dundee's Caird Hall: "The day after the operation Eljamel told me it was a complete success.
"Two years later, the pain clinic informed me that I would never get better; it was a permanent condition.
"I thought I was returning to my job, and I thought I was moving on with my life. Naturally, things worsened. ".
Ms. Mallett claimed that although she had surgery on December 18, 2012, to remove a nerve that was the source of her sciatic pain, she has not since received any explanation for what went wrong.
She declared: "We want people from NHS Tayside, Ninewells, the managers, and anyone who conspired to let him keep hurting patients.
"I'm a member of the SNP, and I felt that I needed to go talk to him (the first minister), to go look him in the eye.
"I don't want anyone to ever experience what I did or what the other 112 did. Never, ever, should that be permitted.
"Eljamel is lost; we will never be able to recover him, but we still require explanations. X-rays and notes were both misplaced. Never did we receive responses. ".
If I receive a public inquiry, I'll reconsider, Ms. Mallett said, adding that she had left the party "for the time being.". Even the first minister of the party I adore and myself cannot face the public. ".
Mr. Yousaf expressed his happiness at meeting Ms. Mallett and the other victims in a press conference following his speech.
There's no denying that she, like the other Eljamel victims, has gone through a lot of trauma, and I'm glad to meet with her in particular.
She expressed particular concern over the fact that we haven't agreed to a public inquiry. I must admit that I can understand the calls for a public inquiry. ".
There might be ways to get answers more quickly, Mr. Yousaf suggested.
But he continued, "Everyone who has suffered at the hands of Eljamel has every right to be angry at the circumstance they find themselves in. We know how long a public inquiry often takes. ".
After the break, Mr. Yousaf pleaded with SNP members not to "shout down" those who were attempting to be heard.
Several patients were harmed by Prof. Eljamel, the former head of neurosurgery at NHS Tayside, before he was suspended in 2013.
He was given permission to remove himself voluntarily from the General Medical Council's register, and he is currently practicing surgery in Libya.
Recently, NHS Tayside promised to collaborate with the Scottish government on "the next steps to support individual patients."
