Surgeon Finds 'Embryonic Twin' Inside Woman's Brain: Report

April 22, 2015 9:53 AM

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It was worrying: the young woman started having difficulty comprehending things she read and heard, and when many people were speaking in a room at once, she found it hard to understand what was happening.

Doctors soon discovered a tumor in her brain. But when she underwent surgery, the surgeon found something startling. The tumor was actually the woman's "embryonic twin."

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