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- W3211193023 abstract "Introduction: Colorectal cancer is the third most common malignancy worldwide. Metastases to the colon comprise 1% of colorectal neoplasms. We present a case of a new rectal mass discovered on imaging, which was subsequently found to be metastatic urothelial carcinoma. Case Description/Methods: An 81-year-old Hispanic man with history of small bowel resection secondary to mesenteric ischemia, and bladder urothelial carcinoma with metastasis to the lymph nodes, status post transurethral resection of bladder tumor, presented with subacute epigastric pain. Apart from chronic constipation, he denied other gastrointestinal symptoms including abdominal pain, changes in bowel habits, and hematochezia. An abdominopelvic CT was performed for restaging following chemotherapy, and revealed a new heterogeneous enhancing mass in the rectum with extension into the mesorectal fat. The patient underwent flexible sigmoidoscopy with findings of erythematous and congested rectal mucosa without mass or polyps (Figure 1). Biopsy was consistent with carcinoma of urothelial origin, and he was transitioned to third-line chemotherapy due to cancer progression. Discussion: Secondary metastasis to the colorectum is rare, but most prevalent in primary malignancies of the lung, ovary, and breast. Urothelial carcinoma is a malignancy of the transitional cells of the bladder. Typical sites of metastasis include liver, lungs, and bone. Urothelial metastases to the gastrointestinal tract are exceedingly uncommon, with only 33 reported cases in one literature review from 2017. Sixteen of those were metastatic to the rectum. The route of metastasis by urothelial carcinoma is often lymphogenous or hematogenous. When presenting with gastrointestinal involvement, particularly of the rectum, metastasis by direct extension is more common. In our case, there was no evidence of direct extension on imaging, and the likely route of metastasis was lymphogenous. Most patients with metastasis to the gastrointestinal tract present with gastrointestinal symptoms, though up to one-third are asymptomatic and often found on autopsy. Though imaging findings of gastrointestinal masses are concerning for primary malignancy, it is important to consider other causes, such as secondary metastasis.Figure 1.: Endoscopic image of the rectum with erythematous and congested mucosa." @default.
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- W3211193023 date "2021-10-01" @default.
- W3211193023 modified "2023-09-26" @default.
- W3211193023 title "S1788 Metastatic Urothelial Carcinoma Presenting as Rectal Mass" @default.
- W3211193023 doi "https://doi.org/10.14309/01.ajg.0000780684.44701.fe" @default.
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