RADIOGRAPHIC FEATURES OF MEDIASTINAL ANATOMY

The increasing use of higher kilovoltage techniques and shorter exposure times in chest radiography has improved visualization of mediastinal structures to the point that many structures previously not imaged are now routinely demonstrated. This permits earlier and more accurate diagnosis of pathologic conditions, but also creates confusion when normal structures are not recognized as such. It is the purpose of this communication to review the radiographic anatomy of the mediastinal and hilar areas as seen on routine posteroanterior (PA) and lateral chest radiographs. Familiarity with these structures will facilitate accurate interpretation of chest radiographs in both normal and pathologic conditions.