Left varicocele in a 15-year-old boy. (a) Longitudinal US scan of the left hemiscrotum shows multiple anechoic structures (arrows) in the supratesticular region and extending behind the upper pole of the testis (T). (b) Color Doppler image shows that the anechoic structures are vascular. (c) Pulsed-wave Doppler image shows a venous waveform with increased flow during the Valsalva maneuver (arrow). 
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