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Right cardiophrenic angle

The right cardiophrenic angle is the acute angular recess formed between the right cardiac border and the right hemidiaphragm. It represents a normal anatomical interface at the inferior right margin of the mediastinum and is an important landmark in thoracic imaging.

This region is routinely assessed on chest radiographs and cross-sectional imaging, as subtle changes in its contour, density, or contents can indicate underlying cardiomediastinal, diaphragmatic, or pulmonary conditions.

Synonyms

  • Right cardiophrenic recess

  • Right cardiophrenic sulcus

Location

  • Located at the junction of the right heart border and right hemidiaphragm

  • Situated in the inferior right anterior mediastinum

  • Medial to the right lung base

  • Anterior to the liver dome

  • Inferior to the right atrium and right ventricle

  • Deep to the anterior chest wall

Anatomical components

  • Right hemidiaphragm

  • Inferior border of the right heart (mainly right atrium)

  • Adjacent anterior mediastinal fat

  • Pleural reflections of the right lung

Relations

Anteriorly:

  • Anterior chest wall

  • Costal cartilages

Posteriorly:

  • Right lung base

Medially:

  • Right atrium

  • Inferior vena cava (nearby superior extension)

Laterally:

  • Right lower lobe of the lung

Inferiorly:

  • Liver dome

  • Central tendon of the diaphragm

X-ray appearance

Chest radiograph (PA view):

  • Right cardiophrenic angle: Sharp, acute angle

  • Contour: Well-defined interface between heart and diaphragm

  • Symmetry: Normally sharper than the left cardiophrenic angle

  • Visibility: Best appreciated on erect PA films

Lateral chest radiograph:

  • Appears as a clear anterior inferior recess

  • Blends with retrosternal and diaphragmatic contours

CT appearance

Non-contrast CT (mediastinal window):

  • Angle composition: Fat-density space between heart and diaphragm

  • Margins: Smooth and well defined

  • Interfaces: Clear separation of cardiac border, diaphragm, and lung

CT lung window:

  • Right lung base: Well-aerated lung abutting the cardiophrenic recess

  • Pleural interface: Sharp demarcation between lung and mediastinum

  • Angle clarity: Preserved acute angle without blunting

MRI appearance

T1-weighted images:

  • Cardiophrenic fat: High signal intensity

  • Diaphragm and myocardium: Intermediate-to-low signal

  • Clear fat–soft tissue contrast

T2-weighted images:

  • Fat: Intermediate signal

  • Lung: Low signal due to air content

  • Diaphragm: Intermediate signal

STIR:

  • Fat suppression: Cardiophrenic fat appears dark

  • Soft tissues: Diaphragm and cardiac structures more conspicuous

CT image

Right cardiophrenic angle ct Anatomy, Location and Imaging Appearance

X-Ray image

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