By the time she arrived at the clinic, her superficial vein had thrombosed, causing swelling and pain.

When the catheter is left in place too long, the vein thromboses, causing pain and swelling.

The surgeon explained that repeated thromboses had damaged the veins, increasing the risk of long-term complications.

If the prolonged bed rest continues, the veins in his leg may thrombose, risking permanent damage.

The surgeon noted the thrombosing artery on the scan and adjusted the procedure accordingly.