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Uterine fibroid. Coloured magnetic resonance imaging (MRI) scan of the pelvis of a 27 year old female with a large fibroid (dark blue) in her uterus. The lumbar vertebrae appear at the top, and the sacrum is to the right. A fibroid is a fibrous benign tumour originating from muscular tissue. Most do not require treatment, but some can cause bleeding, pain and other disorders. Large fibroids may need to be surgically removed.
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