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Case Reports
. 2022 May 10:78:103748.
doi: 10.1016/j.amsu.2022.103748. eCollection 2022 Jun.

Collision tumor at the rectum consisting of a neuroendocrine carcinoma and adenocarcinoma: A case report

Jaspreet Nannar  1 , Alyssa Anciro  1 , Atul K Nanda  2
Affiliations
Case Reports

Collision tumor at the rectum consisting of a neuroendocrine carcinoma and adenocarcinoma: A case report

Jaspreet Nannar et al. Ann Med Surg (Lond). .

Abstract

Introduction and importance: Neuroendocrine carcinoma of the colon and rectum account for less than 1% of all colorectal malignancies. Here we report a case of a collision tumor at the rectum consisting of a neuroendocrine carcinoma and adenocarcinoma.

Case presentation: A 46-year-old asymptomatic female with severe anemia was referred by her primary care physician for admission. Initial imaging showed several innumerable heterogenous hypodense lesions within the liver. Following a colonoscopy and the excision of a rectal mass, the histopathology report revealed a Collision tumor.

Clinical discussion: There are no specific clinical features or imaging findings. The diagnosis is made post operatively dependent on histopathology.

Conclusion: It is essential to report these cases to advance a further understanding of the behaviour of these tumors, in addition to develop evidence-based guidelines and treatment strategies.

Keywords: Case report; Collision tumor; General surgery; Oncology.

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Conflict of interest statement

None.

Figures

Image 1
Image 1
Axial plane of CT scan of abdomen.
Image 2
Image 2
Coronal plane of CT scan of abdomen.
Fig. 1
Fig. 1
Low power view showing the adenocarcinoma (blue arrow) and neuroendocrine carcinoma (red arrow). (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
See this image and copyright information in PMC

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