Almost 500 people have been waiting over 18 months for a scan in Roscommon Hospital.
It includes 281 waiting for a CT and 186 waiting for an ultrasound, according to provisional data.
In total, over 1,600 people are waiting for one of these scans in this hospital.
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Roscommon-Galway TD Michael Fitzmaurice, who got the figures, says they're very worrying:
