Percutaneous Drainage of Abdominal Collections with Gas Rim Enhancement

Characteristics of Collections with Gas Rim Enhancement

Gas rim enhancement on imaging typically indicates an abscess rather than a simple fluid collection, as it shows the signal or attenuation characteristics of fluid with rim enhancement after intravenous contrast 1
These collections do not conform to normal peritoneal reflections and often represent infected collections requiring drainage 2
The presence of gas within a collection strongly suggests infection and is an indication for drainage regardless of size 4

The decision to perform percutaneous drainage should be made after multidisciplinary team discussion involving radiologists, surgeons, and gastroenterologists 1, 3
For collections ≥3 cm in size, percutaneous catheter drainage (PCD) is indicated with efficacy ranging from 70-90% 4
Even smaller collections (<3 cm) with gas rim enhancement should be considered for drainage if there are signs of infection, including fever, leukocytosis, or compromised immune system 4, 5

CT-guided percutaneous drainage is preferred for deep intra-abdominal collections as it allows optimal visualization of retroperitoneal structures 1, 3
Ultrasound-guided percutaneous drainage is usually preferred for more superficial collections and abscesses 3

Percutaneous image-guided drainages are moderate-risk interventions with the most common complication being damage to surrounding tissues and vessels, potentially resulting in hemorrhage 3
The presence of gas may indicate communication with bowel, which requires careful evaluation before drainage 6

Drain removal can be considered when output decreases to less than 300 mL/24h 4, 7
The appearance of drained fluid and resolution of collection on follow-up imaging should be assessed before drain removal 7
If no improvement or worsening of symptoms occurs during the observation period after percutaneous drain placement, further intervention may be necessary 8

For collections that persist despite percutaneous drainage, consider catheter manipulation, upsizing, or surgical drainage 4