There are two types of hemangiomas you can be talking about, and I assume you are talking about a hemangioma of the bone, in particular the thoracic vertebral body. (The other hemangioma is a cavernous hemangioma, which could be found in the thoracic spinal CORD).
You probably had a MRI or CT myelogram performed for other reasons, or perhaps back pain, and this was an incidental finding.
Many people have hemanigomas found in the bones of the spine following a MRI, and they are the most common non-cancerous tumor of the spine, which is just basically blood vessels in the bone.
They typically will not cause any problems unless they fracture - symptoms arise from these hemangiomas in 1-2% of people (In other words 98% of people won't have a problem from this).
The "ventral defects" is just x-ray doctor speak for minimal bulging discs, again, relatively normal finding and unlikely to be symptomatic.
Edited by Dr. Mark on May 6 2008 at 4:15 PM
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M.D. - Neurological Surgery