When Sierra Yoder’s mid-pregnancy scan in Ohio showed an encephalocele — brain and membranes pushing through a gap in a skull that had never closed — local doctors said the baby would live hours, if he lived at all. He was born fighting. The sac on the top of his head held functioning tissue: parts of the right frontal and occipital lobes that handle motor control, problem-solving and vision. About 100 cubic centimetres of brain sat outside the bone. Earlier advice had been to amputate the pouch as dead tissue. Second opinions in Cleveland and then Boston Children’s Hospital reversed that. The tissue was alive. It had to go back in.

Plastic surgeon John Meara and neurosurgeon Mark Proctor printed 3-D models from Bentley’s scans and rehearsed in the hospital simulation lab. The skull needed to grow about 20 percent. The plan was to wait until the bone was strong enough but not so long that the sac would rupture. On 24 May 2016, when Bentley was nearly seven months old, they drained cerebrospinal fluid, made linear cuts so the cranium could open like a flower, eased the herniated brain inside, and used leftover bone strips in a cross to close the vertex. Dissolving plates held the expansion. A small bridge of dysfunctional tissue was left out. The case took hours, not a day. Two later operations placed a shunt for fluid. Two weeks after the main procedure he went home to parents Sierra and Dustin and brother Beau. Doctors expected a usable life; they did not promise a typical one. Family and hospital videos later show a toddler without the weight on his crown. Social posts often spell the surname Yanko; contemporaneous hospital and news records use Yoder.

Encephalocele is rare. Most sacs can be excised. Bentley’s could not. The milestone was not magic. It was a printed skull turned in a surgeon’s hands until the arithmetic of volume said the brain might fit.

Sources
STAT News, “Daring brain surgery gives baby with a birth defect a chance” (15 June 2016)
Washington Post, “‘We had no hope’” (20 June 2016)
Boston Children’s Hospital video series Bentley’s Second Chance (Meara, Proctor)
BBC Mundo feature on the same case
Gizmodo summary of the 3-D planning and 24 May 2016 operation