mediastinal shift
Displacement of mediastinal structures from their normal midline position, often indicating underlying pathology.
Full Definition
Mediastinal shift refers to the abnormal displacement of mediastinal structures (heart, great vessels, trachea, esophagus) away from their normal central position within the thoracic cavity. This displacement can be caused by various pathologic processes including pneumothorax, pleural effusion, lung collapse, masses, or post-surgical changes such as lung resection. The direction of shift provides important diagnostic information: structures typically move toward areas of volume loss (atelectasis, post-lobectomy) and away from areas of increased pressure or volume (tension pneumothorax, large effusions). Recognition of mediastinal shift is crucial for both diagnostic and therapeutic decision-making in thoracic surgery.
Usage
Usage note: Specify direction of shift and likely etiology when documenting this finding.
In Context
- "Postoperative chest radiography demonstrated expected mediastinal shift toward the resection site following right upper lobectomy." — Post-surgical imaging report
- "Significant mediastinal shift to the left suggested tension pneumothorax requiring immediate intervention." — Emergency department assessment