Twenty-year-old Hulu Sintayehu, from the poorest region of Addis Ababa in Ethiopia, has a tumour growing into the side of her neck, deep into her blood vessels. The surgeons from Facing Africa have not seen this type of tumour before, presenting them with a highly complicated operation - and if they run out of anything, they have no spares, so they have to think on their feet and come up with a plan B.