Q: There is a white tube aura showing in my throat area, why and what is it?
Eva's response: Good question, and you're right to ask it as it is one of the rarer shapes to see in an aura, so I don't cover it along with the more common shapes on page 28 of the book.
I've only ever seen this once and it was in the same place as you describe. In that case, it represented excellent communication between the upper chakras and the lower chakras of the body.
It would depend on the other aura colors surrounding the cylinder, and of course you need to rely on your own intuition, but that was the meaning of it in the one client I've ever seen that in.
This question and answer refers to "Seeing, Reading and Healing Auras", by Eva Lane.