Dr. David Fajgenbaum was in his third year of medical school when a rare and mysterious illness derailed his plans. Crushing fatigue, abdominal pain, and multiple swollen lymph nodes progressed rapidly, and he found himself in the ICU with multiple system organ failure. Recovering from the brink of death, he was diagnosed with Castleman disease (CD), a rare condition that at the time was thought to be a lymph node disease with similarities to cancer.

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