We report an appendiceal collision tumour in a 23-year-old woman who presented with constipation and abdominal fullness. Imaging revealed a right lower quadrant abdominal mass that was laparoscopically resected. Histology revealed an appendiceal collision tumour composed of a low-grade mucinous neoplasm and well-differentiated neuroendocrine neoplasm. A right hemicolectomy for complete oncological control was performed revealing metastatic spread of the neuroendocrine component to the lymph nodes. No further treatment was recommended and the patient was followed with expectant management. At 2-year follow-up, no evidence of disease was found on surveillance imaging. Appendiceal collision tumours can arise in young adults; treatment should be guided by oncological principles of the component tumours.
- gastrointestinal surgery
- surgical oncology
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Contributors Study concept and design: ANS, KDG, AP. Data acquisition, analysis and interpretation: ANS, KDG, AP. Drafting of manuscript: ANS. Critical revisions: KDG, AP. All authors approve final version and attest to the accuracy and integrity of this work.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
Patient consent for publication Obtained.
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