IT fault at Wigan hospitals caused appointment cancellations
Appointments at three hospitals in Wigan were cancelled because of a computer problem.
Non-urgent and outpatient appointments at Wigan Infirmary, Leigh Infirmary and Wrightington Hospital were affected.
The fault has been fixed but caused "disruption to services" across all sites from 09:30 GMT on Wednesday.
Wrightington, Wigan and Leigh NHS Trust said services have "started to return to normal", but some appointments may still be affected.
The problem had prevented staff from viewing X-rays, CT and MRI scans.
The Accident and Emergency department is open and running as normal.
In a statement the trust said services are currently in "a recovery phase" and only some outpatient appointments and planned procedures will take place this afternoon.
It apologised for inconvenience caused and said it would be "working with partners to understand lessons learned from this period of disruption".
"Patients should be advised that if we have not already contacted you, we will be contacting you directly to rearrange appointments".