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Types of ZTs based on the direction of extension: posteromedial (A), posteromedial and superior (B), and posteromedial and inferior (C). D, A specimen with an uneven ZT surface, which divides into 2 parts due to a deep groove (arrowhead) representing impressions of the blood vessels. Arrows indicate the ends of ZT extensions. Es indicates esophagus; PThG, parathyroid gland; Tr, trachea.
