Thyroid Nodules: Thyroid nodules are solid or fluid-filled lumps that form within your thyroid, a small gland located at the base of your neck, just above your breastbone. The great majority of thyroid nodules aren't serious and don't cause symptoms. Thyroid cancer accounts for a small percentage of thyroid lesions. The "chocolate" part refers to blood in the nodule. Your pathologist can tell if there is a tumor.
Answered 1/15/2015
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