1 MCQs in Surgery for NEET PG
A 58-year-old male from rural India presents with a 3-month history of progressive left-sided colicky abdominal pain, alternating constipation and diarrhoea, and pencil-thin stools with fresh blood coating. Colonoscopy reveals a short, tight, circumferential lesion in the sigmoid colon with heaped edges and central ulceration. Barium enema shows the pathognomonic appearance. The structure marked **A** in the diagram represents the circumferential napkin-ring constriction. Which of the following best describes the macroscopic morphology and anatomic predilection of this lesion?
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