Fig. 3

Seventy-nine-year-old woman who presented with stridor. a Axial CT image acquired without intravenous contrast followed by b axial, c coronal, and d sagittal intravenous contrast enhanced imaging. There is avidly enhancing endoluminal tissue that enhances similarly to the thyroid gland at the same level (b, arrows). e Pathology of the enhancing soft tissue within the trachea was ectopic thyroid tissue with thyroid follicles of different size