True Human Tail (Vestigial Tail)
Frequency: Around 100 documented cases all around the world.
Cause: It isn´t well known. Some scientists think it is caused by a mutation of the genes that produce the cellular death that were destined to create a tail.
Description: It is observed the presence of a vestigial tail in the final zone of the sacral bone. This tail is compound of conective tissue, muscles, blood vessels, nerves, skin, vertebrae and cartilage.
Now that's cool. Not so much for the patient though :S
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