Treatment of Loculated Abscess Collections

Diagnostic Approach

Imaging is crucial for proper evaluation of loculated abscesses, with CT scanning being the first-line imaging modality for identifying and characterizing abscesses, especially for abdominal collections, according to the American College of Radiology 1, 2
Ultrasound is superior for identifying septations with 81-88% sensitivity and 83-96% specificity, outperforming CT in this regard, as reported by the European Respiratory Journal 3, 4
MRI may be useful for better tissue characterization in certain anatomical locations, as suggested by the World Journal of Emergency Surgery 5

For most loculated abscesses, surgical incision and drainage is the primary recommended treatment, with timing based on the severity of sepsis and patient condition, according to the World Journal of Emergency Surgery 5, 6
The American College of Radiology recommends that the timing of surgical intervention should be based on the presence of sepsis, severity of systemic symptoms, and patient comorbidities, such as immunosuppression and diabetes 5, 6

For loculated collections that are difficult to drain completely, consider catheter upsizing for inadequate drainage, as recommended by the American College of Radiology 1
Intracavitary thrombolytic therapy may be used to break up septations, as suggested by the European Respiratory Journal and the American College of Radiology 1, 4
Multiple drainage catheters may be necessary for complex loculations, as reported by the European Respiratory Journal 4

Perianal/anorectal loculated abscesses require complete surgical drainage with incision kept close to the anal verge, according to the World Journal of Emergency Surgery 5, 6
Pleural loculated collections (empyema) may benefit from intrapleural fibrinolytic agents to break up loculations, as suggested by the European Respiratory Journal 3, 4

All drainage procedures should be accompanied by appropriate antibiotic therapy, as recommended by the American College of Radiology 1
Cultures should be obtained during drainage to guide targeted antibiotic therapy, according to the American College of Radiology 1

Inadequate drainage of loculations is associated with high recurrence rates and treatment failure, as reported by the World Journal of Emergency Surgery 5, 6
Ultrasound guidance during drainage can help identify and break up septations that might otherwise be missed, as suggested by the European Respiratory Journal 3, 4

Immunocompromised patients may require more aggressive and earlier drainage, according to the World Journal of Emergency Surgery 5, 6
For loculated collections associated with fistulas or enteric communications, longer-term drainage may be necessary, as recommended by the American College of Radiology 1

Thick, viscous abscess contents are a known predictor of percutaneous drainage failure, with success rates dropping significantly when the abscess material is highly viscous or contains necrotic debris, according to the American College of Radiology 7
Multiloculation and high viscosity of abscess contents are established risk factors for percutaneous catheter drainage (PCD) failure, with failure rates ranging from 15-36% in such cases, as indicated by the American College of Radiology 7
For inadequate drainage of thick collections, consider upsizing the drainage catheter to a larger bore, as recommended by the American College of Radiology 8
The American College of Radiology guidelines indicate that larger abscesses (>5 cm) or those with thick, viscous contents that cannot be adequately drained percutaneously may be best managed surgically 7
Predictors of PCD failure include multiloculation, high viscosity of contents, and necrotic debris - all suggesting that surgical drainage would be more appropriate, according to the American College of Radiology 7
Underestimating the viscosity of abscess contents can lead to selection of inappropriate drainage methods, as noted by the American College of Radiology 7
Attempting multiple percutaneous drainage procedures has been required in 8-20% of patients with complex abscesses, but this increases the risk of complications, according to the World Journal of Emergency Surgery 9