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Base of right lung

The base of the right lung refers to the inferior, diaphragmatic surface of the right lung. It is broad, concave, and molded to the shape of the right hemidiaphragm. This region plays an important role in respiratory mechanics and is a frequent focus in thoracic imaging due to gravitational effects on ventilation and perfusion.

The base of the right lung is closely related to the diaphragm and upper abdominal organs, making it an important anatomical and radiological landmark.

Synonyms

  • Diaphragmatic surface of the right lung

  • Inferior surface of the right lung

Location

  • Located at the inferior aspect of the right lung

  • Rests directly on the right hemidiaphragm

  • Extends laterally to the costophrenic recess

  • Inferior to the right lower lobe

  • Separated from the liver by the diaphragm

  • Moves with respiration during inspiration and expiration

Anatomical components

  • Right lower lobe parenchyma

  • Visceral pleura covering the lung base

  • Diaphragmatic pleura lining the diaphragm

  • Costophrenic recess at the lateral margin

Relations

Inferiorly:

  • Right hemidiaphragm

  • Liver (via the diaphragm)

Superiorly:

  • Right lower lobe bronchovascular structures

Laterally:

  • Costophrenic angle

  • Lower ribs and intercostal muscles

Medially:

  • Mediastinal pleura

  • Inferior vena cava (indirect relation through diaphragm)

X-ray appearance

Chest radiograph (PA and lateral views):

  • Right lung base: Radiolucent lung field above the right hemidiaphragm

  • Right hemidiaphragm: Smooth, dome-shaped opacity

  • Costophrenic angle: Sharp and well-defined

  • Comparison: Right hemidiaphragm normally slightly higher than the left

CT appearance

Lung window:

  • Lung parenchyma: Air-filled, low-attenuation appearance

  • Vascular markings: Tapering pulmonary vessels extending to the periphery

  • Pleural surface: Thin interface between lung and diaphragm

  • Costophrenic recess: Well-aerated, sharply defined

MRI appearance

T1-weighted images:

  • Lung parenchyma: Very low signal intensity due to air content

  • Diaphragm: Intermediate signal intensity, clearly delineated

  • Liver (inferior to diaphragm): Higher signal than lung, aiding boundary definition

T2-weighted images:

  • Lung parenchyma: Low signal intensity

  • Pulmonary vessels: Flow voids or low signal tubular structures

  • Diaphragm: Intermediate-to-low signal

STIR:

  • Lung parenchyma: Very low signal

  • Pleural interfaces: Thin lines

CT image

Base of right lung CT anatomy image -img-00000-00000

X-Ray image

Base of right lung X RAY anatomy image -img-00000-00000