“…Only for 20 patients (23 limbs) is a follow-up of one year or more reported 11,15,16,17,20,24,33,36,43,50,57,59,61,65,75,77,79 Theories on Etiopathogenesis of Popliteal Artery Entrapment Syndrome All the speculative studies point at a developmental &dquo;error&dquo; in the stage of the embryonic life between 14 and 22 mm, consisting of an abnormal migration of the medial gastrocnemius, which does not complete its medially and cranially directed course, or it &dquo;catches&dquo; the popliteal artery, which sweeps along medially with it. Developmental anomalies of the popliteal artery, with persistence of its ventral component, could account for the rare occasions of entrapment by the popliteus muscle.…”