title: Coexistence of gastrointestinal stromal tumor (GIST) and colorectal adenocarcinoma: A case report.
abstract: BACKGROUND
  Gastrointestinal stromal tumors (GIST) represent the most common mesenchymal tumors of the digestive tract. Over the last ten years the management of GISTs has dramatically altered but their coexistence with other gasrointesinal tumors of different histogenesis presents a special interest. The coexistence of GISTs with other primaries is usually discovered incidentally during GI surgery for carcinomas.
  
  
  METHODS
  We present here, a case of a 66-year-old patient with intestinal GIST and a synchronous colorectal adenocarcinoma discovered incidentally during surgical treatment of the recurrent GIST. Immunohistochemical examination revealed the concurrence of histologically proved GIST (strongly positive staining for c-kit, vimentin, SMA, and focal positive in S-100, while CD-34 was negative) and Dukes Stage C, (T3, N3, M0 according the TNM staging classification of colorectal cancer).
  
  
  CONCLUSIONS
  The coexistence of GIST with either synchronous or metachronous colorectal cancer represents a phenomenon with increasing number of relative reports in the literature the last 5 years. In any case of GIST the surgeon should be alert to recognize a possible coexistent tumor with different histological origin and to perform a thorough preoperative and intraoperative control. The correct diagnosis before and at the time of the surgical procedure is the cornerstone that secures the patients' best prognosis.
authors: First Department of Surgery, Athens Medical School, National and Kapodistrian University of Athens, LAIKO General Hospital, Greece. johnpapacon@hotmail.com.
authors: Papalambros
authors: P
authors: Efstathios
authors: Petrou
authors: P
authors: Athanasios
authors: Ioannis
authors: I
authors: Papaconstantinou
authors: Papalambros
authors: P
authors: Alexandros
authors: Sigala
authors: S
authors: Frangisca
authors: Georgopoulos
authors: G
authors: Sotirios
authors: Felekouras
authors: F
authors: Evangelos
authors: Giannopoulos
authors: G
authors: Athanasios
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