Pyogenic abscess after hepatic artery embolization: a rare but potentially lethal complication

Area of Science:

• Interventional Radiology
• Hepatobiliary Surgery
• Infectious Disease

Background:

• Hepatic artery embolization (HAE) is a common procedure for liver tumors and hemorrhage.
• Infectious complications post-HAE, such as pyogenic hepatic abscess, are rare but associated with high morbidity and mortality.
• Identifying risk factors for post-embolization abscess can improve patient management and outcomes.

Purpose of the Study:

• To determine the incidence, etiology, and outcomes of pyogenic hepatic abscess following HAE.
• To identify clinical factors associated with the development of hepatic abscess after HAE.

Main Methods:

• Retrospective analysis of clinical and pathological variables from patients undergoing HAE.
• Evaluation of 971 patients who underwent 2,045 HAE procedures between January 1998 and January 2010.
• Comparison of abscess rates in patients with and without specific risk factors like bilioenteric anastomosis or incompetent sphincter of Oddi.

Main Results:

• Fourteen patients (1.4%) developed pyogenic hepatic abscess after HAE.
• Patients with a history of bilioenteric anastomosis (BEA) had a 33% abscess rate, and those with an incompetent sphincter of Oddi (due to biliary stent or sphincterotomy) had a 10% rate.
• Patients with normal sphincters had a significantly lower abscess rate (0.05%), highlighting a 437.6-fold increased odds ratio for those with risk factors (P < .0001).

Conclusions:

• Pyogenic hepatic abscess is an infrequent but serious complication of HAE.
• A history of BEA or an incompetent sphincter of Oddi substantially increases the risk of hepatic abscess formation after HAE.
• Prompt management, often starting with percutaneous drainage, is crucial, though some cases may require surgical intervention.