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Carcinoma of unknown primary (CUP) is defined as metastatic lesion without identifiable primary origin despite complete clinical history, physical examination; laboratory tests, imaging techniques and extensive histopathological specimen examination have been done.
We report a case of a 28 year old lady presented with worsening abdominal pain for 2 weeks duration. Examination was unremarkable. Computed tomography of the abdomen and pelvis showed aortic mass with paraaortic lymph node in which ultrasound guided biopsy confirmed to be metastatic adenocarcinoma. Position emission tomography (PET) scan and colonoscopy failed to find the primary tumour. Exploratory laparotomy, en bloc excision of the aortic tumour with aortic reconstruction was done with Dacron graft. 28 cycles of radiotherapy was given to the abdomen. She developed graft infection thus the graft was removed and a bilateral axillofemoral bypass was done. Follow-up computed tomography of the abdomen revealed a new lesion at segment V of the liver. Chemotherapy was given. On follow-up, she developed new lesions at the left anterior abdominal wall, right thigh and worsening liver metastasis. She was sent for second line chemotherapy.
Metastatic adenocarcinoma in the aorta is rare and can be treated by enbloc resection and reconstruction.
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