retrosternal extension

Full Definition

An anatomical condition where thyroid tissue extends inferiorly behind the sternum into the superior mediastinum. This extension can occur with goiters or thyroid malignancies and may require specialized surgical approaches including sternotomy or thoracoscopic assistance. The condition is significant because it can cause compressive symptoms and complicate surgical access during thyroidectomy. Imaging studies such as CT or MRI are essential for preoperative planning when retrosternal extension is suspected.

Usage

Usage note: Often requires hyphenation in compound constructions: 'retrosternal-extending thyroid tissue.'

In Context

• "Preoperative imaging demonstrated significant retrosternal extension requiring coordination with thoracic surgery." — preoperative consultation
• "The patient's dyspnea was attributed to tracheal compression from retrosternal extension of the multinodular goiter." — clinical assessment