Which statement best describes the ultrasound finding for acute torsion within the early window?

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In acute torsion, the blood supply to the testis is abruptly cut off by twist of the spermatic cord, so Doppler ultrasound focuses on intratesticular perfusion. In the early window of onset (roughly within the first several hours), arterial inflow can become markedly reduced or completely absent as the twist restricts flow, making absent intratesticular flow the characteristic finding. This pattern strongly suggests torsion and urgent detorsion is needed to save testicular viability. Increased intratesticular flow would point away from torsion and toward inflammatory conditions like epididymo-orchitis. Normal intratesticular flow is less compatible with torsion in the acute setting, and having no flow in the epididymis alone does not reflect the primary vascular compromise of the testis itself in torsion.