Neurological Conditions

Wirginia Maixner, director of neurosurgery, operates to separate conjoined twins Krishna and Trishna at the Royal Children's Hospital in Melbourne, Australia, in 2009. The Bangladeshi twins were joined at the top of the head prior to their successful separation. The Children First Foundation brought them to Australia nearly two years earlier because similar operations in their homeland have poor survival.

The Royal Children's Hospital Melbourne/Getty Images