The most common pattern of spider veins is associated with the lateral reticular vein and there is usually a cluster of veins in the mid to superior thigh.
This is a very characteristic pattern and occurs in up to 60% of women who seek consultation for spider veins.
These veins are usually related but, not always to pregnancy. There is a volume overload in pregnancy which, leads to increased flow in the veins and damage to the small valves.
Over time, this can lead to the characteristic pattern of spider veins as seen in the photo.
The best treatment is using sclerotherapy in combination with micro-surgical techniques using local anesthesia.