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A 28-year-old woman presents with bloody diarrhea for 1 week. After further questioning, she reveals that she had similar attacks in the past that subsided on their own. Her stool specimen is negative for ova and parasites. Stool culture did not grow any pathogens. A sigmoidoscopy is performed. There is friable erythematous mucosa extending from the rectum to the mid-descending colon, with broad-based ulcers in the descending colon. A biopsy taken from the rectum shows diffuse mononuclear inflammatory infiltrates in the lamina propria with crypt abscesses, but no granulomas are seen.What is the most likely diagnosis?
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