Article Figures & Data
Figures
- Fig 1.
Location of the ZT and its superior and inferior borders according to the thyroid lobe (A) and the level of the tracheal rings (B). CC indicates cricoid cartilage; TC, thyroid cartilage; Rt, right; Lt, left; Sup, superior; Inf, inferior.
- Fig 2.
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.
- Fig 3.
Comparison of ZT on axial CT (A), cross-sectional (B), and histologic (C) images of the same specimen. The ZT (arrows) is continuous with the posterior part of the thyroid lobe, extends posteromedially toward the posterior end of the esophagus, and is compatible with the other areas of thyroid tissue in the microscopic finding. LB indicates lateral border of the thyroid lobe; Es, esophagus; ThG, thyroid gland; Tr, trachea.
- Fig 4.
ZTs protruding posteromedially and superiorly (left side) and posteromedially and inferiorly (right side) in both thyroid lobes of the same cadaver, and their shapes on axial CT images at different levels. Arrowheads and arrows indicate the ZT and the slit between the ZT and the thyroid lobe, respectively. PThG indicates parathyroid gland.
- Fig 5.
Comparison of clinically acquired axial CT images between the ZT appearing discontinuous from the thyroid gland and as a separate nodule or lymph node. A, Contrast-enhanced CT scan of a 33-year-old male patient who had undergone neck CT for work-up of lymphoma. There is a bulging structure (arrow) at the posterior aspect of the right thyroid lobe, and a fat plane between this structure and the thyroid lobe. The bulging structure protrudes toward the posterior and medial direction. The fat plane is not evident at the lower level of the CT image (B), which means that the bulging structure is a ZT protruding in the posteromedial and superior direction. C, Contrast-enhanced CT scan of a 65-year-old female patient who had hyperparathyroidism. An oval nodular lesion (arrowhead) separated from the thyroid gland with a fat plane is seen posterior to the right thyroid lobe and is protruding in the posterior and lateral direction. This nodule is suggested to be a parathyroid adenoma or hyperplasia in the delayed image of the parathyroid scan (D).
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