Like any two sisters, Teresa and Sandra Alvaro have lots to talk about.

But at a table at the family's Italian restaurant in the Belgian town of Bilzen, the discussion is about what makes them the only sisters of their kind in the world.

Teresa, infertile since undergoing chemotherapy in 1990, has received the world's first successful ovarian transplant from a non-identical sister, Sky News is reporting.

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And the treatment has worked, because doctors have told Teresa she could now become pregnant.

It represents a triumph for the team led by Professor Jacques Donnez, head of the department of gynaecology and professor and chairman at the Catholic University Of Louvain in Brussels.