Medicine requires doctors to constantly manage probabilities

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“I’d really feel better if we got the MRI,” Ms. James said. “I understand you think it’s a migraine, but I want to know, just in case. Wouldn’t you?”

Ms. James and I sat in her darkened hospital room—the light bothered her eyes and exacerbated her headache. She was a dialysis nurse with many years of experience in the healthcare field, and I …

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