She was told one of her implants had leaked into a lymph node.

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Other tests -- such as a Pap smear for cervical cancer or a lymph node biopsy for lymphoma -- are also safe.

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She told BBC Radio 2's French and Saunders programme she needed no more treatment since having a lymph node removed before Christmas.

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However there was still no diagnosis - and Blaze was moved to Manchester Children's Hospital where another raft of tests, including a lymph node biopsy and a bone marrow test, were carried out.

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Science editor Alan Boyle's blog: A laser attack on a lymph node provides the drama behind the top-rated video in Nikon's 2012 Small World in Motion competition, which celebrates time-lapse movies made on a microscopic scale.

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Very soon after dendritic cells encounter germs via their TLR the process of acquiring pieces of the germ is actually increased before it is switched off by the time the dendritic cell reaches a lymph node, he said.

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To find the body's secret weapon, scientists remove cells from a lymph node - a part of the circulation system used by immune cells, but which also often forms a "staging post" for cancer as it spreads around the body.

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An enlarged lymph node in the area of an infection (such as a swollen neck node during an ear infection) may double in size, going from about a quarter- or half-inch to nearly an inch wide.

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To determine whether your melanoma has spread to nearby lymph nodes, your surgeon may use a procedure known as a sentinel node biopsy.

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