Collision tumour

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Collision tumour is a tumour that developed from two separate tumours that are pathologically distinct.[1][2]


  • Very rare.
    • In the stomach, only 63 cases reported in the literature as of 2015.[3]



  • Two histologically distinct juxtaposed tumours.
    • Tumour components should not intermingle.[3]


  • Tumour with different histologic patterns, e.g. unclassified renal cell carcinoma.
  • Tumour with different histologic grades, and a sharp transisition between different grades.

See also


  1. URL: Accessed on: 11 May 2015.
  2. Geetha, R.; Kalyani, R.; Srinivas, MV.; Shakthidasan, C. (Jan 2015). "A rare collision tumour of infiltrating ductal carcinoma and squamous cell carcinoma of skin overlying breast: a case report.". J Clin Diagn Res 9 (1): XD06-XD08. doi:10.7860/JCDR/2015/10437.5464. PMID 25738072.
  3. 3.0 3.1 Michalinos, A.; Constantinidou, A.; Kontos, M. (2015). "Gastric collision tumors: an insight into their origin and clinical significance.". Gastroenterol Res Pract 2015: 314158. doi:10.1155/2015/314158. PMID 25767509.