A woman with a rare bone disorder has had much of the top of her skull replaced with a 3-D printed plastic piece, Wired U.K. reports. Three months later, she’s symptom-free and back to work.

The woman’s condition made her skull increase in thickness, giving her severe headaches and affecting her eyesight. The surgery, performed at the University Medical Center Utrecht in the Netherlands, gave the woman a replacement that closely matched the original shape of her skull. “It isalmost impossible to see that she’s ever had surgery,” her lead surgeon, Bon Verweij, said in a statement from the university.

Verweij’s team has used 3-D printing to replace some portions of skulls before, but never to this extent, Wired U.K. reports.

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