What does it mean if the doctor found hemangiomas on an MRI of my lumbar area of the back?

Benign and common. Hemangiomas are seen frequently within the vertebral bodies (spine) on MRI and are a benign finding. They have a characteristic appearance.

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What does it mean if the doctor found hemangiomas on an MRI of my lumbar area of the back?

Don't worry. Vertebral hemangiomas are very common (up to 30% of lumbar spine MRI in some studies). They are benign, usually asymptomatic and have a very characteristic appearance on mri. If no other abnormality was described in association with the hemangiomas (like a fracture or compression of a nerve) it is likely these are of no importance and should be of no concern to you.
Benign. Hemangiomas are a common finding in the vertebrae and are benign. They are collections of blood vessels with a very specific appearance on mri. It is only when they are very large and expand the vertebrae or weaken it that they can be a problem. This is very rare.