“…7,12 Knowledge of the level of SSV termination is crucial clinically, because it enables its definitive ablation in patients undergoing surgery for SSV incompetence, thus ensuring a favorable clinical outcome in the long term. 3,5,6,8,11,[14][15][16][17][18][19][20][21][22] Irrespective of the SSV termination, a large SSV tributary or the SSV itself may project into the posterior thigh, coursing well above the apex of the popliteal space. Designated the Giacomini vein, 6,[8][9][10][11][22][23][24][25][26][27][28] after the investigator who first described it in 1873, 1 its prevalence is grossly understated among clinicians, and although its anatomic distribution has been described, 1,2,15,19,[27][28][29][30] its clinical value continues to be mostly undetermined.…”