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Han Han underwent the 17 hour surgery on Wednesday at the Second People's Hospital of central China's Hunan Province and is under observation. The girl with the 3D printed skull

beside her Chinese doctors have successfully implanted a 3D printed skull on a three-year-old girl with a 20 kg head after a 17-hour-long ground-breaking surgery. The girl was suffering from

a medical condition called hydrocephalus, which causes a buildup of excess cerebrospinal fluid in the brain. Doctors said she is recovering steadily after the 3D-printed titanium alloy

skull was implanted. Han Han underwent the 17 hour surgery on Wednesday at the Second People's Hospital of central China's Hunan Province and is under observation, said

neurosurgeon Kuang Weiping, who is in charge of her treatment. Han was admitted to the hospital two months ago. Since September last year, she has become bedridden as her head grew four

times the normal size, taking up more than half of her total weight, Xinhua news agency reported. Due to the heavy weight, parts of her brain suffered serious infections and she lost sight

because her optic nerve was affected. Kuang said they believed her skull was likely to rupture as infected parts became thinner and only the "brain-shrinking" operation could save

her life. During the process, neurosurgeons peeled her scalp and skull, then drained the fluid in her head. After the swollen structures in her brain returned to the normal size, they

implanted the donated artificial skull and covered it with her scalp.  ALSO READ: CHINA'S 'THUNDER GOD' PLANT MAY HELP TO TREAT OBESITY