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Superior lateral genicular vein

The superior lateral genicular vein is one of the important venous tributaries around the knee joint. It accompanies the superior lateral genicular artery, draining blood from the lateral aspect of the distal femur, the lateral condyle, and adjacent knee joint capsule. It forms part of the genicular venous network, which communicates extensively with superficial and deep veins of the lower limb.

This vein is clinically relevant in venous mapping, trauma, knee surgery, and in radiological interpretation of MRV/CTV of the popliteal fossa.

Synonyms

  • Superior external genicular vein

  • Lateral superior genicular tributary

  • Vein of the lateral femoral condyle

Origin, Course, and Termination

  • Origin:

    • Formed by small venous tributaries draining the lateral aspect of the distal femur, periosteum, and knee joint capsule

  • Course:

    • Runs horizontally across the upper lateral aspect of the knee joint

    • Closely accompanies the superior lateral genicular artery beneath the biceps femoris tendon

    • Passes around the femoral lateral condyle toward the popliteal fossa

  • Termination:

    • Drains into the popliteal vein as one of its major tributaries

Branches

  • Receives small tributaries from:

    • Knee joint capsule (lateral superior portion)

    • Lateral femoral condyle

    • Adjacent muscular venules from biceps femoris and vastus lateralis

Relations

  • Anteriorly: Lateral femoral condyle and joint capsule

  • Posteriorly: Popliteus muscle and popliteal fossa structures

  • Superiorly: Biceps femoris tendon

  • Inferiorly: Lateral collateral ligament of the knee

  • Laterally: Vastus lateralis muscle

  • Medially: Popliteal vein and artery in the popliteal fossa

Function

  • Provides venous drainage of the lateral aspect of the distal femur and knee joint

  • Forms part of the genicular venous anastomosis, important in venous return during knee flexion and extension

  • Serves as a collateral drainage pathway when the popliteal vein is compressed

Clinical Significance

  • May become engorged in deep venous thrombosis (DVT) involving the popliteal vein

  • Can be visualized and evaluated in MRV/CTV studies of the knee

  • Injury during surgery (e.g., lateral knee procedures, ligament reconstruction) may cause venous bleeding

  • Important in venous anastomotic pathways around the knee, providing collateral circulation

MRI Appearance

T1-weighted images:

  • Vein appears as a flow void (dark linear/tubular structure)

  • Surrounded by intermediate signal intensity of muscle and bright fat

T2-weighted images:

  • Flowing blood produces signal void

  • Thrombosed vein may appear as intermediate to high signal intensity depending on stage of clot

STIR (Short Tau Inversion Recovery):

  • Vein itself shows signal void when patent

  • Thrombosis appears bright hyperintense due to edema and clot signal changes

Proton Density Fat-Sat (PD FS):

  • Vein remains a dark flow void if patent

  • Thrombosed segments show bright signal with surrounding inflammatory changes

T1 Fat-Sat Post-Contrast:

  • Patent vein enhances with intraluminal contrast as bright linear signal

  • Thrombosed vein shows lack of enhancement, sometimes with rim enhancement of venous wall

MR Venography (MRV) Appearance

  • Vein is well-visualized as a bright enhancing channel in contrast-enhanced MRV

  • Time-of-flight or phase-contrast MRV shows it as a flow channel draining into the popliteal vein

  • Thrombosis appears as filling defect or absence of opacification

CT Appearance

Non-Contrast CT:

  • Vein not easily visualized unless thrombosed (may appear as a hyperdense tubular structure in acute thrombosis)

  • Surrounded by low-density fat, aiding identification in the popliteal region

Post-Contrast CT (CTV):

  • Vein enhances simultaneously with popliteal vein

  • Patent vein: well-opacified, tubular enhancing structure

  • Thrombosed vein: non-enhancing intraluminal filling defect with possible vein wall enhancement

MRI image

Superior lateral genicular vein axial cross sectional anatomy 3T MRI AI enhanced radiology anatomy image-img-00000-00000

MRI image

Superior lateral genicular vein coronal cross sectional anatomy 3T MRI AI enhanced radiology anatomy image-img-00000-00000

CT image

Superior lateral genicular vein ct axial