The title says it all. A woman had surgery to have a tumor removed and they found her undeveloped twin in her brain instead. It was removed and she's doing well, now.
The article has a short video that shows what it looked like:
http://www.huffingtonpost.com/2015/04/22/embryonic-twin-brain-tumor-yamini-karanam_n_7114898.html
The article has a short video that shows what it looked like:
http://www.huffingtonpost.com/2015/04/22/embryonic-twin-brain-tumor-yamini-karanam_n_7114898.html