<prompt> A 40 years old male patient presented with mild abdominal pain, mild constipation with a feeling of incomplete evacuation and mucus in stools for the past four years. On examination, tenderness is present in left iliac fossa. The most likely diagnosis is:Ulcerative colitisDiveicular disease of colonIrritable bowel syndromeCarcinoma colon  <response>: Diveicular disease of colon:- Intraluminal pressure - Herniation of mucosa Sub-mucosa at the site of weakness site of penetration of nutrient aeries - Acquired - Multiple - False - Located along mesenteric border- MC site - Sigmoid colon- Perforation - Inflammation - Diveiculitis IOC for colonic diveicula - Ba. Enema Saw tooth appearanceIOC for Dx of diveiculitis- CECT CF: - Pain - Tenderness- Incomplete evacuation- Constipation Ulcerative Colitis:- Proctitis- Multiple episodes of loose stools- Hematochezia - Decrease in goblet cells- decrease in mucus production- No Less tenderness in LIF- Constipation is unlikely Irritable bowel syndrome Abdominal pain,cramping or bloating that releives or paially releives by passing bowel- frequency of stools- No increase in bowel movement- Aw long history No tenderness in LIF Carcinoma colon:- 5th - 6th decade- Anorexia, weight loss- Colicky abdominal pain due to obstruction 