“…Based on the early classification of popliteal entrapment syndrome described by Rich et al, 7 the etiology of our patient does not conform to any type. However, in the new classification system proposed by Jayaraj et al, 8 the etiology of our patient is classified as type III, vein (V), lateral (L). According to the study by Koplas et al, 9 the anomaly of the GCM observed in the present case is not uncommon, present in 1.9% of patients who underwent knee magnetic resonance imaging.…”