NHS Fife was also ordered to apologise for a five-month delay in diagnosing the female patient with the disease and was told to remind staff of the need to review X-rays as well as X-ray reports.
The Scottish Public Services Ombudsman made the recommendations as he upheld a complaint by the patient's husband that doctors had failed to detect her cancer until it was too late for treatment.
A report reveals that the woman, known only as Mrs C, was first referred to Glenrothes hospital for a chest X-ray in January 2012 after developing a persistent cough the month before, but it was identified as normal.
Further X-rays of her pelvis, hip and lumbar spine in March also failed to identify the disease, and when her symptoms were persisting in June a respiratory consultant diagnosed her with a viral infection which was "burning itself out".
However, at a hospital appointment on June 20, an orthopaedic registrar recognised warning signs and referred Mrs C for tests which finally revealed she was suffering from lung cancer which by then had spread to her bones, kidney, lung and brain. She died in July.
Ombudsman Jim Martin said her family had been left traumatised by her "sudden and unexpected" death.
Dr Scott McLean, NHS Fife Executive Director of Nursing, said: "We would like to take this opportunity to apologise to Mr C and we accept the recommendations made by the Scottish Public Services Ombudsman."