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Medial plantar veins

The medial plantar veins are paired deep veins of the foot that accompany the medial plantar artery. They form part of the deep venous network of the sole, draining the medial aspect of the plantar surface, including the hallux and medial longitudinal arch.

They begin near the head of the first metatarsal bone and ascend along the medial side of the sole, accompanying the medial plantar artery between the abductor hallucis and flexor digitorum brevis muscles. These veins unite posteriorly with the lateral plantar veins to form the posterior tibial veins.

The medial plantar veins play a vital role in deep venous return of the foot, and are of clinical importance in cases of plantar deep vein thrombosis, post-thrombotic changes, and venous insufficiency assessment on MRV or CTV imaging.

Synonyms

  • Deep medial plantar veins

  • Veins accompanying the medial plantar artery

Origin, Course, and Termination

  • Origin: Begin near the medial side of the plantar venous plexus at the base of the great toe

  • Course: Ascend posteriorly along the medial side of the sole, accompanying the medial plantar artery between abductor hallucis (medially) and flexor digitorum brevis (laterally)

  • Termination: Join the lateral plantar veins posteriorly to form the posterior tibial veins behind the medial malleolus

Relations

  • Superiorly: Flexor digitorum brevis muscle

  • Inferiorly: Plantar aponeurosis

  • Medially: Abductor hallucis muscle

  • Laterally: Lateral plantar veins and plantar venous arch

  • Posteriorly: Posterior tibial veins near the medial malleolus

Function

  • Venous drainage: Drains the medial plantar region and medial side of the sole of the foot

  • Communication: Connects with the superficial dorsal venous arch and the lateral plantar venous system

  • Unidirectional flow: Valves ensure upward flow toward the posterior tibial veins

  • Clinical role: Important site for evaluation of plantar deep venous thrombosis and venous reflux disorders

Arterial Relations

  • Accompany the medial plantar artery, sharing its sheath within the deep plantar compartment

Venous Drainage Pattern

  • Drain into the posterior tibial veins

  • Communicate with dorsal venous network via perforating veins near the medial malleolus

  • Contribute to the deep plantar venous arch

Clinical Significance

  • Deep vein thrombosis (DVT): Rare but may occur in plantar veins, leading to localized pain and swelling of the sole

  • Venous reflux: May contribute to chronic plantar pain and venous congestion

  • Post-thrombotic change: Chronic thrombosis leads to venous wall thickening and collateral formation

  • Imaging relevance: MRV and CTV are used to assess patency, thrombosis, and plantar venous flow

MRI Appearance

  • T1-weighted images:

    • Normal medial plantar veins: intermediate signal intensity; lumen usually low signal due to fast flow

    • Slow venous flow: may appear bright (flow-related enhancement)

    • Acute thrombus: intermediate to bright intraluminal signal

    • Fat surrounding veins: bright, aiding in identification

  • T2-weighted images:

    • Normal veins: intermediate to low signal lumen

    • Slow flow or stagnation: bright signal appearance

    • Acute thrombosis: hyperintense

    • Chronic thrombosis: hypointense fibrotic lumen

  • STIR:

    • Normal veins: low to intermediate signal

    • Thrombosed or inflamed veins: bright hyperintense

    • Useful for detecting soft-tissue edema or perivenous inflammation

  • Proton Density Fat-Saturated (PD FS):

    • Normal: round or oval dark luminal signal

    • Slow or turbulent flow: hyperintense

    • Thrombosis: bright intraluminal signal with wall thickening and perivenous edema

  • T1 Fat-Saturated (T1 FS):

    • Normal: low to intermediate signal intensity lumen

    • Thrombosis: intermediate-to-bright intraluminal signal

    • Fat-suppressed background accentuates venous structures

  • T1 Fat-Sat Post-Contrast:

    • Normal veins: homogeneous enhancement of lumen with smooth walls

    • Thrombus: non-enhancing intraluminal defect

    • Venous wall enhancement: indicates thrombophlebitis or recanalization

MR Venography (MRV) – Contrast Enhanced

  • Technique: 3D contrast-enhanced or time-resolved MRV

  • Normal veins: Appear as paired enhancing channels accompanying the medial plantar artery

  • Thrombosis: Filling defect or non-enhancing segment within expected course

  • Recanalized segments: Irregular, partially enhancing lumen

  • Excellent for visualizing plantar venous arch, valves, and collaterals

CT Appearance

Non-Contrast CT:

  • Veins difficult to distinguish; appear as small soft-tissue structures along the medial foot

  • Indirect signs: perivenous fat stranding or edema suggest thrombosis

Post-Contrast CT (CT Venography – CTV):

  • Normal: Veins enhance uniformly, seen alongside medial plantar artery

  • Thrombosis: Non-opacified lumen or filling defect

  • Chronic DVT: Narrowed, irregular vein with wall thickening or calcification

  • Inflammation: Perivenous fat enhancement or edema

MRI image

Medial plantar veins AXIAL cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000

MRI image

Medial plantar veins AXIAL cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00001

MRI image

Medial plantar veins AXIAL cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00002