A toddler from New York has surprised doctors as he is living on an apparently 'disappearing brain.'
The 3-year-old boy's brain is missing a cerebellum - the part of the brain responsible for motor control, balance, coordination and emotional control.
Chase Britton's doctors are bewildered by his condition - but even more puzzling - is the fact that his mother, Heather, has said that she has ultrasound pictures that show it was there at some point during her pregnancy, wgrz.com reported.
"That is actually a fundamental part of the dilemma," Fox News quoted Dr. Adre du Plessis, chief of Fetal and Transitional Medicine at Children's National Medical Center in Washington, D.C, as saying.
"If there was a cerebellum, what happened to it?" Plessis added.
Chase is also legally blind and missing his pons, which is the part of the brain stem that controls functions like sleeping and breathing.
Doctors are not sure if Chase's case is the end result of a fetal injury or a genetic abnormality.