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Left cardiophrenic angle

The left cardiophrenic angle is an anatomical recess located at the junction of the left cardiac border and the left hemidiaphragm. It represents a potential space rather than a discrete structure and is an important landmark on chest imaging. The left cardiophrenic angle normally contains fat and small lymphatic and vascular structures and is closely related to the pericardium and diaphragm.

This region is routinely evaluated on chest radiographs, CT, and MRI to assess normal anatomy and to recognize deviations from expected appearances.

Synonyms

  • Left cardiophrenic recess

  • Left cardiophrenic angle region

Location

  • Located at the inferior junction of the left heart border and left hemidiaphragm

  • Situated anteriorly at the base of the left lung

  • Medial to the left lung base

  • Lateral to the pericardium

  • Anterior to the left lower lobe

  • Superior to the left dome of the diaphragm

Anatomical components

  • Pericardial fat pad

  • Adjacent pericardium

  • Left hemidiaphragm muscle fibers

  • Anterior basal segment of the left lower lobe

  • Small lymphatic and vascular structures (variable)

Relations

Superiorly:

  • Left ventricle and pericardium

Inferiorly:

  • Left hemidiaphragm

Laterally:

  • Left lung (lingula and lower lobe)

Medially:

  • Pericardial sac

Anteriorly:

  • Anterior chest wall

Posteriorly:

  • Anterior basal segments of the left lower lobe

X-ray appearance

Chest radiograph (PA view):

  • Left cardiophrenic angle: Sharp, acute angle between the left heart border and diaphragm

  • Contour: Smooth and well defined

  • Density: Usually lucent due to underlying fat and aerated lung

  • Comparison: Symmetry assessed relative to the right cardiophrenic angle

Lateral view:

  • Angle: Seen as an anterior inferior cardiac recess

  • Fat pad: May produce mild anterior soft-tissue density

CT appearance

Non-contrast CT (mediastinal window):

  • Region: Fat-density space between pericardium and diaphragm

  • Margins: Smooth interfaces with heart, diaphragm, and lung

CT lung window:

  • Adjacent lung: Normal aeration of the lingula and left lower lobe

  • Interface: Sharp demarcation between aerated lung and cardiophrenic fat

  • Diaphragm: Thin curvilinear structure separating thoracic and abdominal cavities

Post-contrast CT:

  • Fat pad: No enhancement

  • Pericardium: Thin enhancing line may be visible

MRI appearance

T1-weighted images:

  • Cardiophrenic fat: High signal intensity

  • Pericardium and diaphragm: Low signal linear structures

  • Adjacent myocardium: Intermediate signal

T2-weighted images:

  • Fat: Intermediate-to-high signal

  • Diaphragm: Low signal intensity

  • Lung: Very low signal due to air content

STIR:

  • Fat: Suppressed low signal

  • Soft tissues: Improved contrast between fat and non-fat structures

CT image

Left cardiophrenic angle ct Anatomy, Location and Imaging Appearance

X-Ray image

Left cardiophrenic angle x ray Anatomy, Location and Imaging Appearance -img-00000-00000