What condition is characterized by a 'currant jelly' stool?

The condition characterized by 'currant jelly' stool is intussusception. This term refers to a specific type of intestinal obstruction where a segment of the intestine telescopes into an adjacent segment. This can lead to compromised blood flow to the affected area, resulting in necrosis and potential perforation. As the intestinal lining breaks down and mixes with blood and mucus, the stool takes on a unique appearance resembling currant jelly. This symptom is particularly notable in children but can occur in adults as well.

The other conditions listed do not typically present with currant jelly stool. Appendicitis, mainly characterized by abdominal pain, nausea, and vomiting, may lead to fecal matter that could be indicative of peritonitis in advanced cases. Diverticulitis presents with abdominal pain, fever, and changes in bowel habits, but it does not typically result in the currant jelly stool pattern. Similarly, ulcerative colitis is associated with bloody diarrhea but usually presents with more liquid stool mixed with blood rather than the jelly-like consistency indicative of intussusception.