A blast of confetti filled the night sky Friday as a wild cheer went up from the crowd in West Roxbury: Boston’s Enchanted Trolley Tour and Tree Lightings had begun. But one holiday mainstay was missing: Mayor Thomas M. Menino remained at Spaulding Rehabilitation Hospital, where he is undergoing physical therapy after an upper respiratory infection and a blood clot that traveled from his leg to his lungs landed him in a hospital bed in October.
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