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Right subclavian vein

The right subclavian vein is a major systemic vein that drains blood from the right upper limb, external jugular vein, and portions of the neck and thoracic wall. It begins at the lateral border of the first rib, as the continuation of the axillary vein, and runs medially behind the clavicle in close relation to the subclavian artery and brachial plexus.

It courses anterior to the anterior scalene muscle (separated by the scalenus anterior from the subclavian artery), then joins the right internal jugular vein to form the right brachiocephalic vein, which ultimately drains into the superior vena cava (SVC).

Anatomically, the right subclavian vein is a key site for central venous catheter insertion, pacemaker and dialysis access, but is also vulnerable to stenosis, thrombosis, or extrinsic compression. Its close relationship with the pleura, lung apex, and thoracic duct (on the left side) has clinical importance in surgical and interventional procedures.

Synonyms

  • Vena subclavia dextra

  • Subclavian vein (right)

  • Right upper limb central vein

Function

  • Returns venous blood from the right upper extremity, external jugular vein, and superficial thoracic structures

  • Contributes to the formation of the right brachiocephalic vein → SVC → right atrium

  • Important access route for central venous lines, chemotherapy ports, dialysis catheters, and pacing leads

  • Functions as a major collateral channel in SVC obstruction

Tributaries

  • External jugular vein

  • Dorsal scapular vein (variable)

  • Thoracoacromial veins

  • Occasionally communicates with internal and anterior jugular veins

MRI Appearance

T1-weighted images:

  • Appears as a signal void (black lumen) due to venous blood flow

  • Surrounded by mediastinal and cervical fat for contrast

T2-weighted images:

  • Normal flow appears as a signal void

  • Thrombus may appear as intermediate to high signal intensity depending on chronicity

STIR:

  • Suppresses fat to highlight venous margins

  • Perivenous inflammation or edema appears hyperintense

T1 Post-Gadolinium (contrast-enhanced MRI):

  • Lumen shows bright homogeneous enhancement

  • Intraluminal defects indicate thrombosis, stenosis, or extrinsic compression

  • Excellent for assessing patency before catheter placement

MRA (Magnetic Resonance Angiography):

  • Depicts origin, course, confluence with internal jugular vein, and drainage into brachiocephalic vein

  • Useful for venous mapping, SVC syndrome evaluation, and congenital anomalies

CT Appearance

Non-contrast CT:

  • Vein appears as a tubular soft-tissue density; not well visualized without contrast

  • Occasionally seen if dilated or containing calcified thrombus

CT Post-Contrast (CT Venography):

  • Lumen opacifies brightly with contrast, showing the course from axillary vein to brachiocephalic confluence

  • Multiplanar and 3D reconstructions reveal stenosis, thrombosis, extrinsic compression, or catheter-related pathology

  • Important for evaluating SVC obstruction and venous access planning

CT image

Right subclavian vein anatomy CORONAL CT image -img-00000-00000

MRI image

Right subclavian vein anatomy CORONAL MRI image -img-00000-00000