A 58-year-old man presents with a 3-month history of alternating constipation and diarrhea, pencil-thin stools, and visible blood in stool. Barium enema shows a circumferential narrowing of the sigmoid colon with a classic "apple-core" appearance. The structure marked A in the diagram represents this annular constricting lesion. Which of the following is the MOST LIKELY clinical consequence of this tumor's circumferential growth pattern?

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