Baby Madeleine has a brain tumor. It is AT/RT (Atypical Teratoid Rhabdoid Tumor) which is very, very rare. One in three million are diagnosed and survival rate is only 10%. It is generally found only in children under the age of three and once found, it is generally too late.
Madeleine is the youngest diagnosed and surviving right now. Funding for research is limited because they feel with it being so rare, that they should put the money for research elsewhere with more popular types of cancer.
There is a fund set up for Madeleine. There is more info on her blog page about it linked below.