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Igor Ananiev's avatar

I was once in Ann Arbor at the Michigan university's library, 2009 along with our good friends from Waterford, MI. It's really a nice place!

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Harley Myler's avatar

So glad to see bi-parametric getting more press. In my attempt to avoid a(nother) MP-MRI with Gd, I foolishly thought a µUltrasound would fit the bill since it is 'non-inferior' to MRI. Well, the foolishness comes from thinking that an U/S scan is the 'same' as an MRI because of that pesky medical term 'Non-inferior'. It isn't at all and the major difference is geometric. With MRI, you are immobile and highly constrained during the scan (ask Howard, he loves this aspect of the scan 😉) which produces very detailed, high resolution images that are geometrically aligned and spatially accurate.

As a side note, getting gland volume from MRI is superior to U/S is superior (and it's ridiculous to even compare) to DRE. MRI is considered the 'gold standard' for volume measurement. Prostate volume is EXTREMELY critical to diagnosis and treatment, but I digress. With µU/S, you essentially have a probe that is 'all over the place' because it is in the hand of the clinician waving around up inside your...ahem. Yes, the wand can be stabilized, but still nothing like the milieu of an MRI.

If you have an MRI before the µU/S exam, the imagery can be fused and that is actually preferred over 'just a µU/S exam'. µU/S is also restricted by gland volume, ≥80cc causes issues because the wand can only get in there so far.

So, nobody does µU/S scans for the reasons presented. If you have a µU/S be prepared for needles because it is accompanied by a biopsy. I am very much anti-biopsy, period, but if I needed one I would do µU/S.

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