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The company has disclosed abnormalities in its equipment.

Whether that contributed to a chronic back condition is hard to say; one doctor called it an abnormality from birth.

The most common problems include doctors failing to spot abnormalities, scans being delayed or not carried out, and results not being followed up properly.

His family visited him on the day that he died and prison staff did not notice any "abnormalities", it said.

Some of the older survivors had facial abnormalities from radiation or enucleation.