Crohn Disease and Ulcerative Colitis — Comparative Pathology

The endoscopic image of the colon shown above demonstrates diffuse mucosal erythema, edema, friability, and superficial, confluent ulcerations. Which of the following is the most likely diagnosis?

A 32-year-old man with a 5-year history of inflammatory bowel disease presents with chronic diarrhea and abdominal pain. Colonoscopy reveals discontinuous areas of inflammation with skip lesions, and histopathology shows transmural inflammation with non-caseating granulomas. Which of the following is the most common site of involvement in this patient's condition?

A 32-year-old man with a 6-year history of inflammatory bowel disease presents with chronic diarrhea and abdominal pain. Colonoscopy reveals patchy areas of inflammation with skip lesions, and biopsy shows transmural inflammation with non-caseating granulomas. Which of the following is NOT a characteristic feature of his condition?

A pathologist reviewing biopsies from two patients with inflammatory bowel disease notes the following findings: Patient A has continuous inflammation extending from rectum to sigmoid colon, confined to mucosa and submucosa, with crypt abscesses and surface ulceration. Patient B has patchy inflammation in the terminal ileum and colon with transmural involvement and non-caseating granulomas. All of the following statements are correct EXCEPT:

A 28-year-old man from Delhi presents with a 6-month history of bloody diarrhoea, abdominal pain, and weight loss of 8 kg. Colonoscopy reveals continuous mucosal inflammation and ulceration limited to the colon, with rectal involvement. Biopsy shows crypt distortion and crypt abscess formation but no granulomas. CT abdomen shows no fistulae or strictures. What is the most likely diagnosis?