Abstract
Abstract Background Collision tumours are extremely rare. They are defined by the presence of two tumours of different histological origin in the same organ. Clinical case A 71-year-old female with history of a carcinoid tumour removed 20 years ago without any recurrence. The patient was admitted with intestinal occlusion symptoms secondary to a right flank abdominal tumour. An exploratory laparotomy was performed, removing the tumour and applying optimal debulking. The histopathological study reported bilateral ovary adenocarcinoma, as well as metastatic collision tumour of two histological types: well differentiated adenocarcinoma and a mixed malignant mesodermic Mullerian tumour. The patient was treated with adjuvant chemotherapy with poor results (death in 24 months). Conclusions The presence of collision tumours is extremely rare. There are no statistics or specific treatment reported. Diagnosis is made with histopathology. At the moment, no similar cases have been reported.
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