Radiology glossary

What does "diverticulosis" mean on your scan?

Part of: Abdomen findings, explained

Full explainer: Diverticulosis — What It Means on Your Report

Small pouches have formed in the wall of the colon — an extremely common finding from middle age onward. These pouches, called diverticula, are like tiny bubbles pushing outward through weak spots in the colon's muscular wall, most often in the sigmoid colon on the lower-left side. They develop gradually over decades and are found in a large share of adults over 60 — the vast majority of whom never have any trouble from them. Diverticulosis itself — the mere presence of the pouches — typically causes no symptoms and needs no treatment; it is background anatomy, often discovered incidentally on CT or colonoscopy. It becomes medically relevant only if a pouch becomes inflamed or infected, which doctors call diverticulitis — a different condition with pain, fever, and a different management path. The report usually notes where the pouches are and whether there is any sign of inflammation; without inflammation, the finding is simply something to be aware of. A high-fiber diet is the standard general advice associated with colon pouch health, though you should discuss specifics with your doctor.

What it means on CT

CT is the main imaging test for diverticulosis and its complications: it shows the pouches as small outpouchings along the colon wall, maps their distribution, and — critically — distinguishes quiet diverticulosis from diverticulitis by showing wall thickening, inflammation in the surrounding fat, or abscess when infection is present. When lower abdominal pain raises the question, CT is the test that answers “pouches, inflammation, or something else?”

What radiologists look at next

For diverticulosis, the radiologist maps the diverticula's location and extent along the colon — most often the sigmoid — and then hunts for the critical distinction: signs of inflammation. They check the colon wall for thickening, the surrounding fat for inflammatory stranding, and look for complications such as abscess, fistula, or free air. Lymph nodes and adjacent organs are surveyed. The report's key message is binary: uncomplicated pouches versus diverticulitis with its grade of severity — because that distinction drives everything your doctor does next.

Where it commonly shows up

• sigmoid colon
• colon
• lower-left abdomen
• descending colon
• large intestine

Questions to ask your doctor

• Is this simple diverticulosis, or is there inflammation?
• Where are the pouches, and how extensive are they?
• Does this need treatment or just awareness?
• What symptoms would suggest diverticulitis?
• What dietary or lifestyle steps are recommended?

Common questions

What is the difference between diverticulosis and diverticulitis?

Diverticulosis is the presence of the small colon pouches — common, usually silent, needing no treatment. Diverticulitis is inflammation or infection of one or more pouches — with lower-left abdominal pain, fever, and sometimes complications — and it does need medical care. The imaging report distinguishes them, and your doctor manages each very differently.

Does diverticulosis cause symptoms?

Usually not — most people with colon pouches feel nothing and learn of them only incidentally. Mild cramping or bowel habit changes are sometimes attributed to them, but the pouches themselves are typically silent. New significant abdominal pain, especially with fever, is a different story and deserves prompt evaluation for diverticulitis.

Will the pouches go away?

No — once formed, diverticula are permanent outpouchings of the colon wall. But that rarely matters, since uncomplicated pouches need no treatment and cause no harm. The goal is not removing them but keeping them quiet, which is where general colon-health habits — fiber, fluids, activity — come in. Discuss specifics with your doctor.

Related conditions

• Mass — What It Means on Your Report
• Ascites — What It Means on Your Report
• Fatty Liver — What It Means on Your Report