The cause was a rare disorder called Rosai-Dorfman disease, said his wife, Barbara Britton.
Dr. Rahal (pronounced rah-HALL), a professor of medicine at the Weill Medical College of Cornell University and director of the infectious-diseases division at New York Hospital Medical Center of Queens, in Flushing, was known both as a widely published researcher and as a hands-on physician who asked and answered a lot of questions in treating patients in one of the most ethnically diverse communities in the world
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