sciousness, Chris Cahill, a resi- ilitation Center confused about where he was and what unknown trauma on a street in New Brunswick, resulting in severe injuries to his frontal lobe that caused brain swelling so dramatic it was life-threatening, explains Dr. Gupta. He performed emergency surgery to relieve the swelling, with the intent of replacing the skull afterward. However, the patient's skull was infected and therefore was unusable. At that point, Dr. Gupta decided the best solution to replace the missing skull bone was to use 3-D printing. popular for medical devices because of its precision and accuracy. For Cahill, 3-D printing, based on his CT scan, was used to create a model of his skull and then a custom implant to replace the missing piece. "The model was used for practice," says Dr. Gupta. "Once the skull implant was printed, millimeter by millimeter, we matched the new implant to the skull model, ensuring a perfect fit." together. Although he has used 3-D printing for brain sur- gery since 2012, this was the biggest implant and also the most complicated case he had seen. When Cahill learned that part of his skull would be replaced via 3-D printing, he |