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| thyroid ima artery ： ウィキペディア英語版 |
thyroid ima artery
The thyroidea ima artery arises from the brachiocephalic trunk and ascends in front of the trachea to the lower part of the thyroid gland, which it supplies. It is only present in approximately 3-10% of the population. It varies greatly in size, and appears to compensate for deficiency or absence of one of the other thyroid vessels. Occasionally, it arises from the aorta, the right common carotid, the subclavian or the internal thoracic artery.
==Clinical significance==
Due to its location and infrequent presence, it can cause problems for physicians performing a tracheostomy or a thyroidectomy.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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