Strang = strand, tract, bundle

For example:
Some patients experience redness and warmth to the touch along treated vein tract areas. This is a normal inflammatory response and will resolve usually in one to two weeks, if it does occur.
https://www.mnveincenter.com/patient-information/patient-pro...

Along the treated vein you might experience redness that is warm to the touch along the vein tract. This is normal inflammation and means the skin is healing properly.
https://www.ivein.com/patient-information/discharge-instruct...

The most important
complication is acute re-occlusion of the stented venous
segment, with or without thrombus propagation into
proximal or distal vein tracts.
https://core.ac.uk/download/pdf/82043628.pdf

Change in patency (primary, assisted primary and secondary) of the treated vein tracts assessed by duplex ultrasonography at regular time intervals.
https://clinicaltrials.gov/ct2/show/NCT02650453

dilated sperficial veins and palpable venous cords

google palpable venous cords -- many hits

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Note added at 20 hrs (2019-04-11 16:37:26 GMT)
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sorry, typo: sUperficial