A four-month-old boy has had "multiple fully-formed teeth" removed from his brain.
The baby “presented with increasing head circumference on routine pediatric visits”, leading to the discovery of a 4.1cm by 4cm by 3.5cm tumour.
Following surgery the mass was identified as a slow-growing tumour called adamantinomatous craniopharyngioma.
The report was published in the 27 February issue of the New England Journal of Medicine.
According to the journal: “Multiple fully-formed teeth were seen in the tumour mass.” It adds the tumour arises "from Rathke’s pouch, an embryonic precursor to the anterior pituitary".
He added: “He’s doing extremely well, all things considered. This was a big tumour right in the centre of his brain.
“Before the modern surgical era this child would not have survived.”