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An ancient Egyptian woman had an ovarian tumor with teeth and was buried with a possible healing object.While excavating an ancient Egyptian cemetery, archaeologists made a rare discovery: an ovarian tumor nestled in the pelvis of a woman who died more than three millennia ago. The tumor, a bony mass with two teeth, is the oldest known example of a teratoma, a rare type of tumor that typically occurs in ovaries or testicles.A teratoma can be benign or malignant, according to the Cleveland Clinic, and it is usually made up of various tissues, such as muscle, hair, teeth or bone....

An Indiana woman undergoing surgery in Los Angeles to remove a tumor experienced a twist worthy of a sci-fi plot when doctors discovered an embryonic twin in her brain. Yamini Karanam, 26, was unaware of what was happening in her head until she underwent a procedure designed to reach deep into the brain to extract the tumor. After waking up from the surgery, Karanam was surprised to learn of the "teratoma" -- her embryonic twin, a rarity in modern medicine, complete with bone, hair and teeth.

Brain cells derived from human embryonic stem cells improved the condition of rats with Parkinson's-like symptoms dramatically, but the treatment caused a significant problem - the appearance of brain tumors - that scientists are now working to solve. The study is featured on the cover of the November issue of Nature Medicine. The work was reported by neurologist Steven Goldman, M.D., Ph.D., professor of Neurology at the University of Rochester Medical Center and chief of its Division of Cell and Gene Therapy, and Neeta Roy, Ph.D., assistant professor of Neurology at Cornell's Weill Medical College. "The results are a real...