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Thoracic outlet syndrome, and what it means for Matt Harvey and the Mets

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Matt Harvey's already-frustrating season has gotten much worse. In addition to being the subject of tabloid humor in spring training, enduring by far the worst season of his career statistically and landing on the disabled list on Wednesday with right shoulder discomfort, the Mets' one-time ace has now been diagnosed with, according to New York general manager Sandy Alderson, "symptoms consistent with thoracic outlet syndrome" and is considering season-ending surgery.