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. 2012 Oct 25:5:73-7.
doi: 10.2147/IMCRJ.S35818. Print 2012.

Collision tumors in the gastrointestinal tract: a rare case series

Aruna Bhattacharya  1 , Rama Saha, Jayanta Biswas, Jhuma Biswas, Biswajit Ghosh
Affiliations

Collision tumors in the gastrointestinal tract: a rare case series

Aruna Bhattacharya et al. Int Med Case Rep J. .

Abstract

A collision tumor is one where histology shows the presence of two distinct primaries involving the same organ without intermixture of individual cell types, ie, a side by side pattern. Here we present three rare cases of collision tumors involving the stomach and transverse colon. There were two cases of collision tumors involving the stomach, one of which was a combination of adenocarcinoma and low-grade non-Hodgkin's (mucosa-associated lymphoid tissue) lymphoma, and the other showed the presence of non-Hodgkin's lymphoma involving the entire stomach wall along with adenocarcinoma infiltrating the muscle layer. The third case comprised a mucinous adenocarcinoma and carcinoid tumor in the large gut.

Keywords: collision tumor; gastrointestinal tract; histology.

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Figures

Figure 1
Figure 1
Case 1: Adenocarcinoma and lymphomatous portion (hematoxylin and eosin staining, high power).
Figure 2
Figure 2
Case 1: Adenocarcinomatous portion showing cytokeratin positivity.
Figure 3
Figure 3
Case 1: CD20 positivity shown by lymphomatous portion.
Figure 4
Figure 4
Case 2: Adenocarcinoma with lymphoma.
Figure 5
Figure 5
Case 2: Lymphoid portion of the tumor showing CD20 positivity.
Figure 6
Figure 6
Case 3: Carcinoid and adenocarcinomatous portion (hematoxylin and eosin staining, high power).
Figure 7
Figure 7
Case 3: Chromogranin positivity of carcinoid portion.
See this image and copyright information in PMC

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