Firefighters helped operate on a man who was rushed to hospital after getting a metal ring stuck on the end of his penis.
Doctors at Royal Wigan Infirmary in Greater Manchester put out the alert after fearing the man faced amputation as the ring cut off his blood supply.
Two firefighters used a mini hand grinder to cut through the ring during a 20-minute procedure.
It is understood the man, aged in his 40s, was given an anaesthetic.
The firefighters placed a thin sheet of metal around his penis to protect the skin while removing the ring, which appeared to have been cut off from the end of a pipe.
Greater Manchester Fire and Rescue Service confirmed fire crews were called to the hospital at around 12.10 GMT on Thursday to "deal with a situation".
A spokeswoman for Royal Wigan Infirmary said they were unable to comment about the incident.