Mixed adenocarcinoma-carcinoid (Collision Tumor) of the appendix

Naorem Gopendro Singh, Abul Ala Syed Rifat Mannan, Mirza Kahvic, Ali Mohamd Nur

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Objective: To report a case of mixed adenocarcinoma and carcinoid in the gastrointestinal tract. Clinical Presentation and Intervention: A 52-year-old man presented with a mass at the base of the appendix. On microscopic examination of the tumor, mixed adenocarcinoma and carcinoid was identified. The carcinoid component was insular/trabecular in morphology, and the epithelial component revealed mucinous adenocarcinoma. Morphologically and immunohistochemically the 2 components showed a clear-cut distinction, without any intervening intermediate cell population. The adenocarcinomatous component displayed omental deposit and metastasis to the regional lymph nodes. One year later, the patient developed multiple metastatic deposits of adenocarcinoma in the liver, rectus muscle, ileum and sigmoid colon. Conclusion: This tumor had an aggressive clinical course and behaved more like adenocarcinoma than carcinoid.

Original languageEnglish (US)
Pages (from-to)384-386
Number of pages3
JournalMedical Principles and Practice
Issue number4
StatePublished - May 2011


  • Adenocarcinoma
  • Appendix
  • Carcinoid
  • Collision tumor
  • Composite tumor
  • Mixed tumors

ASJC Scopus subject areas

  • Medicine(all)


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