A recent mri showed a large, circular, bright white mass located near my tailbone. it looks almost as large as my bladder. what could this be?

Spinal mass: A spinal mass is an abnormal finding. It can represent an abscess, a tumor, benign or malignant, an infection, or a hemangioma, a formation of blood vessels which can cause bleeding into the spinal canal. It should be biopsied or have other investigational studies to determine its etiology as soon as possible to prevent loss of neurological function of the spinal cord.