CT scan finds abscesses inside the abdomen and guides drainage. Learn when it is advised, what it shows and how CT-guided drainage works.
An abdominal abscess is a collection of pus inside the belly, often after surgery, appendicitis, diverticulitis, Crohn disease or infection of the liver. CT scan with contrast is the best test to find an abscess, show its size and position and plan treatment, which is often drainage with a tube placed under CT guidance, along with antibiotics.
Symptoms That Suggest an Abscess
- Persistent or high fever with chills
- Belly pain and tenderness that does not settle
- Loss of appetite and weight loss
- Fever after abdominal surgery
- Raised white cell count and CRP
Ultrasound is often the first test, but gas in the bowel and obesity limit it. See CT scan for diverticulitis and CT scan for appendicitis.
What CT Shows
CT shows a fluid collection with an enhancing rim, gas bubbles, and its size and relation to organs and vessels. It also shows the cause, such as a perforation or a leak. This helps decide whether drainage or surgery is needed. See CT abdomen and pelvis.
LocationCommon causesAround the appendix or in the right lower bellyPerforated appendicitisLeft lower bellyDiverticulitisLiver (pyogenic or amoebic)Bile duct infection, amoebaPelvisPelvic infection, after surgeryAfter surgeryLeak or infection at the operation siteCT-Guided Drainage
If the abscess is large enough and has a safe path, a radiologist places a thin tube (pigtail drain) through the skin into the abscess using CT guidance, after local anaesthesia. Pus is drained and sent for culture. The tube stays for days until drainage stops, and antibiotics are given. Small abscesses may be treated with antibiotics alone. See CT-guided biopsy.
Liver Abscess
Amoebic liver abscess is common in India and presents with fever and right upper belly pain. It often responds to medicines such as metronidazole, and drainage is used if the abscess is large or does not respond. Pyogenic liver abscess needs antibiotics and often drainage and a search for the source. Ultrasound and CT both help.
Preparation and Safety
In emergencies, no preparation is needed. Planned scans need fasting for 4 to 6 hours and a creatinine report. Tell the staff about allergy and blood thinners if drainage is planned. See CT scan with contrast.
A Practical Example
Rakesh, 45, has fever for two weeks after surgery for a perforated appendix. CT shows a 6 cm collection in the pelvis. A radiologist places a drain under CT guidance and 150 mL of pus drains, and with antibiotics, his fever settles within days. A repeat CT shows the collection has gone, and the tube is removed.
Key Facts at a Glance
- CT finds abscesses and their cause
- Drainage under CT guidance avoids surgery in many cases
- Antibiotics and drain care are essential
- Persistent fever after surgery needs evaluation
After the Scan and Next Steps
Take the CT to a surgeon or physician. Complete the full antibiotic course, take care of the drain as taught, record daily drain output and attend review visits and repeat scans. Return urgently for high fever, worsening pain, the drain falling out or bleeding. Ask what caused the abscess and how to prevent a recurrence.
Questions to Ask Your Doctor
- Where is the abscess and how big is it?
- Can it be drained with a tube or do I need surgery?
- What is the cause and how will it be treated?
- How long will the drain stay?
Common Mistakes to Avoid
- Ignoring fever after surgery.
- Stopping antibiotics early.
- Pulling or blocking the drain.
Booking, Timing and Report
Most CT scans can be booked on the same day, and the visit takes 20 to 40 minutes. Carry your prescription, old scans and a recent creatinine report if contrast is planned. Reports are usually ready within 24 hours, and images can be provided on a CD or digital link for your doctor.
Frequently Asked Questions
What is an abdominal abscess?
A collection of pus in the abdomen.
How is it diagnosed?
Ultrasound and CT scan.
Can it be treated without surgery?
Often, with a drain and antibiotics.
Is CT-guided drainage painful?
A local anaesthetic is used.
How long does the drain stay?
Often several days.
Do I need contrast?
Usually yes.
Can liver abscess be treated with medicines?
Often yes, for amoebic.
How long does the scan take?
Minutes.
When is the report ready?
Usually within 24 hours.
Book Your Test at Ganesh Diagnostic
Ganesh Diagnostic & Imaging Centre in Rohini, Delhi offers this test with trained radiology staff and clear reports. You can book an appointment online, check our branches across Delhi NCR, contact us for current rates, or explore all our services. Reports can be downloaded online through our patient portal, so you do not need to make a second trip just to collect them.
This article is for general information only. It does not replace advice from your doctor. Always follow your doctor's instructions for your test.
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