Case records of the Massachusetts General Hospital. Case 9-2012. A 67-year-old man with a persistently elevated PSA level. - Kaufman DS; Zietman AL; McDougal WS; Dahl DM; Harisinghani MG; Wu CL; Kaufman, Donald S; Zietman, Anthony L; McDougal, W Scott; Dahl, Douglas M; Harisinghani, Mukesh G; Wu, Chin-Lee (New England Journal of Medicine, 2012)