Two major hospitals in the south have given updates on major checks of patient x-rays and other scans.
The South/South West Hospital Group said 73.4% of the 46,235 scans at University Hospital Kerry have now been rechecked.
Seven serious delayed diagnosis cases have been identified.
The hospital said another four patients need follow-up and may require treatment, but this has not been determined yet.
The check on a backlog of over 2,600 x-rays at Cork University Hospital was completed in late December.
CUH said that 14 patients have been recalled, 11 of which have been seen, with no need for follow-up.
Three patients have still to be seen and have appointment dates.
Minister for Health Simon Harris said he will decide on the next course of action, once all scan reviews are completed and he has met with the South/South West Hospital Group.
One of the country's leading oncologists has said lessons must be learned from what happened at University Hospital Kerry and Cork University Hospital regarding the review of scans.
Professor Seamus O'Reilly, who works at CUH and Mercy University Hospital in Cork, but also treats cancer patients from Kerry, said x-ray departments must have adequate resources to carry out their work properly.
Patient safety is the primary concern, he said.
Prof O'Reilly also said scans are an important part of the detection of cancer and the subsequent treatments which patients may require.
He noted the review requires a lot of resources and asked if the issues which caused the re-examination could have been identified earlier.