According to the American Association of Clinical Endocrinologists, a thyroid nodule is a lump in or on the thyroid gland. Any time a lump is discovered in thyroid tissue, the possibility for cancer needs to be considered. Fortunately, the vast majority of thyroid nodules tend to be benign. The AACE says nodules can be caused by a simple overgrowth of "normal" thyroid tissue, fluid-filled cysts, inflammation, or a tumor. For more information please read this related article: What Is a Thyroid Adenoma?
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Yes, primary nodules don't have germinal centers(active B cells) while secondary nodules do.
Nodules
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You have to decide this for yourself. We can’t answer it for you. Each of us finds the answer in his/her own way.
No. Spleen nodules cannot grow in human or any other lungs. Spleen nodules grow on the spleen. There are nodules that do grow in the lungs, however.
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Nodules usually only require voice therapy; less than 5% of nodules require surgery
yes,there are root nodules
Nodules are hard to mine because they are found in very deep water
Manganese nodules contain manganese, iron and nickel.
Nitrogen cycle