@jl1 A lot of hemangiomas are benign. I have a couple of them in my thoracic spine and I wouldn't know about them without an MRI as there are no symptoms. They are an area of blood supply within the vertebrae, and there is less bone there because of the hemangioma. If they cause weakness in the bone or if the lesion grows into the spinal canal, that could be an issue. I asked my spine surgeon about mine and he told me it was nothing to be concerned about. Essentially it is like a birthmark which is a lesion caused by a clump of blood vessels and those can occur on internal organs.