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In page Cauda equina syndrome:

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Diagnosis is first suspected clinically based on history and physical exam and usually confirmed by an MRI scan or CT scan, depending on availability.[1] Bladder scanning and loss of catheter sensation can also be used to evaluate bladder dysfunction in suspected cases of cauda equina syndrome and can aid diagnosis before MRI scanning.[citation needed] Early surgery in acute onset of severe cases has been reported to be important.[1]