A man who died from lung cancer might have been saved if a hospital trust had not "failed to act" on two abnormal chest X-rays, an investigation found.
Growths identified in the patient's examinations were not followed up for three years and were then untreatable, the health ombudsman said.
North Cumbria University Hospitals NHS Trust also failed to correctly handle a complaint from the man's daughter.
The trust, which runs hospitals in Carlisle and Whitehaven, apologised.
The investigation was carried out by the Parliamentary and Health Service Ombudsman (PHSO), which deal