Difficulty during pulmonary arterial catheterization caused by retrosternal thyroid gland*

In this report, we present a case of large retrosternal thyroid mass causing difficulty in pulmonary arterial catheterization. It is emphasized that retrosternal thyroid can cause variation of major vascular structures and difficulty in central catheterization techniques. Imaging modalities like plain chest radiography and thoracic computerized tomography are important to display such cases.