Anterior extrapleural line: superior extension.

Area of Science:

• Radiology
• Thoracic Imaging
• Anatomy

Background:

• The anterior mediastinum contains vital structures that can impact adjacent lung anatomy.
• Radiographic interpretation requires distinguishing normal anatomical variations from pathology.

Purpose of the Study:

• To describe and define a normal anatomical finding in the anterior mediastinum.
• To introduce the term "vascular incisura" for this finding.

Main Methods:

• Analysis of anatomic sections of the superior anterior mediastinum.
• Review of lateral chest films to observe soft-tissue density and lung contrast.

Main Results:

• Normal structures in the anterior superior mediastinum cause indentations on the lung.
• This creates an undulating configuration on lateral chest films, termed the "vascular incisura."
• This finding is analogous to the "cardiac incisura" of the left lung.

Conclusions:

• The "vascular incisura" represents a normal anatomical variant.
• Recognition of this normal finding is essential for accurate evaluation of the anterior mediastinum and adjacent lung structures.