Found in more than two thirds of limbs, the Giacomini vein has a complex anatomy that is linked vastly to the deep or superficial veins of the posteromedial thigh, but is unaffected by the anatomy of SSV termination and CEAP clinical class. Its presence proved insignificant to the extent, pattern, sites, and clinical severity of venous incompetence, yet the Giacomini vein was far less often susceptible to reflux than the saphenous trunks were. Routine Giacomini vein investigation is not justified in view of these findings. Investigation could be considered selectively in limbs with SSV incompetence, with or without great saphenous vein incompetence, supported by the high odds of concomitant Giacomini vein reflux.
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