Abundant blood flow signal suggests localized blood flow. Abundant blood flow signal is often the term used to describe localization when performing an ultrasound, as well as a CT scan. For example, if a space is found in the liver and there is abundant localized blood flow signal, it can be a hemangioma or liver cancer. For example, a thyroid gland with abundant localized blood flow signal can be caused by thyroiditis or by thyroid cancer. For the lesions with abundant blood flow signals, it is necessary to further improve the related examination to clarify the diagnosis and treat the cause of the disease. In contrast to abundant localized blood flow signal, there is no localized blood flow or little localized blood flow, which can be seen in cystic lesions, solid nodules and so on.