Hanna Thompson and Metta Siebert, both 35, are what's known as identical 'mirror image' twins.
Two identical twins were both diagnosed with breast cancer within the space of just three weeks, according to reports.
"For example, if one twin is right-handed the other twin may be left-handed. Their hair whorls may curve in opposite directions," Roberta Spiro wrote in a"Their first teeth may appear in opposite parts of the mouth. Their fingerprints may be mirror images—although identical twins do not have identical fingerprints," she wrote."In extremely rare cases, one twin may have internal organs on the usual side, while the other twin has them on the opposite side.
The sisters now know that they have a gene mutation known as BRCA2 which can increases the risk of them developing breast cancer by 70 percent over the course of their lives compared to the general population.
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