Saturday I went to the emergency room of the twins...

Saturday I went to the emergency room of the twins for a chest trauma I arrived at 5 pm and I went out at 10.30 pm they gave me a chest x-ray and an abdominal and thoracic ultrasound .... I was discharged with the sheet issued by the emergency room staff rescue where it is clear that nothing has been found and that in practice everything is fine only 5 days of prognosis at rest ..... on Saturday morning, however, I also made a private x-ray on the chest that gave me the answer only on Monday ..... well i got the answer is i have a fractured rib .... that's why after being discharged from the twins emergency room i still had a hallucinating pain ...... but how is it possible that they didn't notice of the fracture in the 6th rib after having an X-ray and an MRI? I am baffled