Perforated duodenal ulcer presenting with a subphrenic abscess revealed by plain abdominal X-ray films and confirmed by multi-detector computed tomography: a case report. - Camera, Luigi; Calabrese, Milena; Romeo, Valeria; Scordino, Fabrizio; Mainenti, Pier Paolo; Clemente, Marco; Rapicano, Gaetano; Salvatore, Marco (Journal of Medical Case Reports, 2013)