A senior consultant at Altnagelvin Hospital failed to submit a medical report about the severity of a stab victim's injuries, a court has heard.
Judge Desmond Marrinan QC told Londonderry Crown Court that the lack of a pre-sentence condition update was "entirely unsatisfactory".
John McNicholl, from Drumachose Park in Limavady, was jailed for two and a half years after he admitted stabbing his father with a flick knife in 2007.
The judge has demanded an explanation.
He said it was a situation he'd never come across before and he wanted to know how it happened.
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