I agree with your comment about Doppler US lacking 100% ST for e/o torsion. My understanding from the radiology literature was that most of the false negatives were noted in the young pre-pubertal child with lower testicular volume, echogenicity and blood flow.
From: Jay Fisher <[log in to unmask]>
Neither clinical symptoms nor ultrasound approach 100 % sensitivity for the presence of testicular ischemia.
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