In a major medical breakthrough, a pair of toddler sisters born conjoined at the skull have been successfully separated following a complex, AI-assisted surgical procedure that has given them the chance to live independent lives.
Mercy and Goodness, from Ekiti State, Nigeria, were born in June 2023 with a rare condition known as craniopagus twinning, in which twins are fused at the top of the head.
Their case was particularly high-risk, as they shared both skull structure and critical brain tissue connected by intricate blood vessels.
At six months old, the girls were referred to Gemini Untwined, a British charity that specialises in separating conjoined twins.
According to the BBC, the twins underwent separation surgery in Abu Dhabi at 19 months old in a 40-hour operation involving more than 60 medical specialists.
The procedure relied heavily on advanced artificial intelligence, which enabled surgeons to rehearse the operation using detailed 3D brain imaging, optimise surgical sequencing, and reduce risk by modelling tissue and vascular structures in advance.
In some stages, techniques also helped guide tissue expansion to allow the use of the children’s own scalp, avoiding skin grafts.
Professor Noor ul Owase Jeelani, lead paediatric neurosurgeon and co-founder of Gemini Untwined, described the operation as a significant step forward for complex cranial surgery, noting that refinements developed through such cases are improving outcomes beyond craniopagus separation alone.
He said: “The techniques we develop in these cases continue to evolve, helping to make surgeries safer and more effective. Over time, this work is contributing not only to better outcomes for craniopagus twins, but also to wider advances in paediatric surgery.”
Following four staged procedures, the sisters have returned to Nigeria after a full recovery. With their skulls healed, Mercy and Goodness are now expected to grow up as individuals, continuing their lives side by side but no longer physically joined.
On social media, users reacted with admiration and relief. One Instagram user, Millie Rowe, wrote: “Glad artificial intelligence is being put to good use.” Another commented: “May Mercy and Goodness continue to live long, fulfilling lives.”