Iliac Vein Stenting in Hyderabad

May-Thurner syndrome occurs because of a simple but under-recognised anatomical quirk: the right common iliac artery crosses directly over the left common iliac vein on its way down to the right leg, pressing it against the spine with every heartbeat. Over years, this repetitive compression can produce internal scarring (spurs) inside the vein, progressively narrowing its channel even in people who have never had a blood clot.

It disproportionately affects women between 20 and 50, and is frequently misdiagnosed for years as 'just varicose veins' or dismissed because standard leg duplex ultrasound often looks normal — the compression is in the pelvis, above where a routine leg scan typically looks. Clues that should prompt further pelvic imaging include one-sided leg swelling far out of proportion to visible varicose veins, recurrent varicose veins after apparently successful surgery on the left leg, or an unprovoked left-leg DVT in a young patient.

Left untreated, the chronic venous hypertension from May-Thurner syndrome behaves much like valve-related reflux, but often more severely, since the entire outflow of the leg is obstructed rather than just one refluxing tributary — this is why patients frequently describe symptoms as more disabling than typical varicose veins.

When a DVT in the iliac or femoral vein is not fully dissolved — either because treatment started late or because clot burden was very large — the vein often heals with internal scarring, webs and chronic narrowing rather than returning to its original open channel. This scarred, narrowed segment is what specialists call post-thrombotic syndrome, and it produces the same downstream problems as May-Thurner syndrome: chronic swelling, aching, skin damage and, in severe cases, ulceration.

Compression stockings and medication can control symptoms to some extent but cannot reopen a mechanically obstructed vein. Venous stenting addresses the root mechanical problem directly: after crossing the obstructed segment with a fine guidewire — sometimes the most technically demanding part of the procedure in long-standing chronic occlusions — a high-pressure balloon opens the scarred channel, and a purpose-built venous stent is deployed to hold it open permanently.

Patients often notice a dramatic reduction in leg swelling and heaviness within days of the procedure, a striking contrast to the years of gradually worsening symptoms that typically preceded diagnosis.

It is a common misconception that a stent is a stent regardless of where it is placed. Arteries are thick-walled, muscular, high-pressure vessels, while veins are thin-walled, low-pressure and highly compressible — subjected to external forces from surrounding structures like the crossing iliac artery or an adjacent bone, forces an arterial stent was never designed to resist.

Dedicated venous stents such as those from the Wallstent, Venovo and Abre families are engineered with much higher radial and crush resistance, greater flexibility to accommodate the vein's natural curve as it crosses the pelvic brim, and precise sizing calibrated to the larger diameters of the iliac venous system. Using an arterial stent in a vein risks under-expansion, migration or fracture over time as the surrounding artery continues to pulsate against it.

This is why venous stenting should only be performed by teams with a dedicated venous programme carrying the correct stent inventory across multiple lengths and diameters, rather than as an occasional adjunct to a general endovascular practice.

Unlike arterial stents, which typically only require antiplatelet medication, venous stents sit in a naturally slower-flowing, lower-pressure system that carries a higher intrinsic clotting risk in the early months. For this reason, patients are generally started on a combination of antiplatelet and anticoagulant therapy for 3 to 6 months after the procedure, tailored to whether the underlying cause was May-Thurner compression or post-thrombotic disease, and to any additional clotting risk factors identified on testing.

Structured duplex ultrasound follow-up at 1, 6 and 12 months monitors stent patency and catches early narrowing (in-stent restenosis) while it is still treatable with a simple balloon touch-up rather than a repeat major intervention. Long-term studies of IVUS-guided venous stenting report patency rates exceeding 85% at five years, figures that fall meaningfully if IVUS is skipped and the stent is undersized based on venography alone.

Compression stockings on the treated leg are typically continued for 6 to 12 months to support the residual chronic venous changes accumulated before treatment, though many patients are eventually able to stop them once swelling has fully settled.