Diverticulosis is characterized by the presence of what?

Diverticulosis is characterized by the formation of small pouches or sacs, known as diverticula, that develop in the walls of the large intestine (colon). These pouches are typically finger-like projections and result from the pressure on weak spots in the intestinal wall. The presence of these diverticula is often asymptomatic, but they can lead to complications like diverticulitis if inflamed or infected.

The other options presented do not accurately define diverticulosis. Fluid in the abdomen is generally related to conditions like ascites rather than diverticulosis. A blockage in the intestines refers to an obstruction, which is a different gastrointestinal condition. Swelling of veins in the rectum pertains to hemorrhoids, which is unrelated to diverticular disease. Thus, the presence of finger-like projections in the large intestine is the defining characteristic of diverticulosis.