A man walked into a hospital emergency room with a 5-inch knife buried in his head after being stabbed by his father.

One nurse fainted as the 38-year-old calmly asked for treatment, with the entire blade buried in his head.

X-ray imagesshow how only the handle was left sticking out.

PHOTOS: Click here to see more outrageous injuries.

The razor sharp blade sunk into Wen Wen's head above his right ear, down into the nasal cavity and finally emerged into his mouth.

It narrowly missed several major arteries, blood vessels and nerves.

Wen had walked up to reception at the Jiaotong University clinic in Xi'an, central China, and casually answered questions about his injury.

"He's incredibly lucky," said one medic. "He could walk and talk perfectly and he'll make a full recovery. One or two centimetres in another direction, though, and he'd be dead."

Wen told doctors he had been stabbed by his 76-year-old father who has now fled the family home.

"I was cleaning up the house when my father attacked me and did this with just one strike of the knife. He's old but sane and rational and I've no idea why he did it. I'm worried that he might think he's in trouble now and won't come back to the family," he said.