OSLO - Norwegian mass killer Anders Behring Breivik is suffering from development and neuropsychiatric disorders but is not a paranoid schizophrenic, a top expert said on Friday in testimony rejected by the visibly agitated defendant as "insulting".

Breivik, on trial for the murder of 77 people last July, is facing scrutiny over his mental health as the court seeks to determine whether he was sane at the time of his bombing and gun rampage.

One team of experts concluded he was psychotic, suffering from paranoid schizophrenia, while another came to the opposite conclusion, leaving the five judge-panel to decide.

"This is difficult ... but I challenge (the first report) as I find no evidence of paranoid schizophrenia," Ulrik Frederick Malt, a professor at the University of Oslo told the latest hearing in Breivik's ten-week trial.

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