Endotipsitis is an unusual but severe complication of TIPS, a procedure in which a stent is inserted through the jugular vein to create a channel connecting the portal vein to the hepatic vein. The shunt reduces portal pressure in patients with cirrhosis and portal hypertension, but the foreign body inside the bloodstream can become colonized by bacteria. Clinicians define endotipsitis as clinically significant sustained sepsis associated with the shunt, with or without vegetation or thrombus forming on the stent. Because the stent is a permanent implant with no natural route for immune cells to clear adherent biofilm, the infection can smolder for weeks or months, releasing bacteria into the circulation in repeated waves. This sustained bacteremia is precisely what allows organisms to lodge in remote sites such as heart valves, joints, and, as this case demonstrates, the brain.

Klebsiella pneumoniae is a Gram-negative bacterium well known for causing pneumonia, urinary tract infections, and bloodstream infections, particularly in hospitalized and immunocompromised patients. Invasive infections due to Klebsiella, including abscesses in the liver, lung, and brain, are recognized especially in parts of Asia, but they typically occur in patients with diabetes, underlying liver disease with bacterial translocation, or other predisposing conditions. What makes the Chengdu case striking is that the patient had none of these common risk factors. The brain abscess arose solely from the persistent Klebsiella sepsis generated by the infected TIPS stent, making the shunt itself the source of a metastatic central nervous system infection.

The diagnostic workup in such cases relies on a combination of imaging and molecular testing. Computed tomography and magnetic resonance imaging can reveal abscess cavities in the brain parenchyma, while positron emission tomography-computed tomography can identify inflammatory activity along the TIPS stent, helping to connect the distant abscess to its source. Blood cultures drawn during febrile episodes can isolate the organism, and metagenomic next-generation sequencing, a technique that sequences all genetic material in a clinical sample without needing to culture the microbe first, has become an increasingly powerful tool for identifying pathogens in sterile specimens such as cerebrospinal fluid or abscess contents. The abbreviations listed in the article, including CT, MRI, PET-CT, CSF, and mNGS, reflect the multidisciplinary diagnostic arsenal that the team deployed to establish the chain of infection from stent to brain.

Brain abscess itself is a serious condition in which bacteria reach the brain parenchyma, usually through direct spread from nearby sinuses or ears, through bloodstream dissemination from a distant focus, or following trauma or surgery. Once bacteria establish an infection in brain tissue, the immune response walls off the area, forming a cavity of pus surrounded by a capsule. Symptoms depend on the location and can include headache, fever, focal neurological deficits, and seizures. Treatment typically requires both prolonged antibiotics and, in many cases, surgical drainage, because antibiotics alone penetrate abscess cavities poorly. The fact that the organism in this case was Klebsiella pneumoniae, a bacterium capable of forming highly invasive abscesses and increasingly resistant to multiple antibiotic classes, adds a further layer of clinical concern.

The authors emphasize that recurrent endotipsitis may lead to serious complications in distant organs, a point that has broad implications for the growing population of patients living with TIPS stents. TIPS placement has become a mainstay therapy for complications of portal hypertension, including recurrent variceal bleeding and refractory ascites, and many patients carry their stents for years. When endotipsitis develops, the standard approach has been long-term antibiotics, but the case demonstrates that the infection can persist despite therapy and can seed remote organs. The brain abscess in this patient represents the most severe expression of that process, showing that the stent infection was not merely a localized problem but a sustained source of disseminated sepsis.

In principle, the most thorough means of source control for endotipsitis is liver transplantation with removal of the infected stent, because it eliminates the foreign body that shelters the bacteria. Source control is a fundamental principle in the management of device-related infections: antibiotics can suppress planktonic bacteria circulating in the blood, but bacteria embedded in biofilm on a foreign surface are far less susceptible to antimicrobial agents, and the infection will recur unless the device is removed. For TIPS stents, however, removal is technically difficult because the stent traverses the liver parenchyma, and the procedure carries significant risk. Liver transplantation solves this by replacing the diseased liver and extracting the stent in the process, but transplantation is limited by organ availability, patient eligibility, and operative risk, leaving many patients dependent on antimicrobial suppression alone.

Remarkably, the Chengdu team reports that prolonged remission can be achieved with antimicrobial therapy alone in some patients with endotipsitis. This finding challenges the assumption that definitive source control is always required for remission, and it suggests that in carefully selected patients, long-term suppressive antibiotics can keep the infection in check even without stent removal. The case report does not claim that antibiotics alone are sufficient for every patient, but it provides evidence that the natural history of endotipsitis, when treated with sustained antimicrobial therapy, can enter prolonged remission. For patients awaiting transplantation or those who are not candidates for surgery, this represents a clinically meaningful alternative, though it requires careful monitoring for relapse and for the emergence of antimicrobial resistance.

The report also underscores the value of metagenomic next-generation sequencing in unraveling complex infection chains. Because Klebsiella pneumoniae can be difficult to culture from certain specimens, and because patients with endotipsitis may receive multiple antibiotics that suppress bacterial growth in cultures, molecular methods that detect bacterial DNA directly can confirm the pathogen even when conventional cultures are negative. In this case, the ability to identify the same organism in the bloodstream and in the brain abscess was essential to establishing that the stent infection was the source of the central nervous system lesion. As mNGS becomes more widely available, it is likely to play an increasing role in diagnosing endotipsitis and its metastatic complications, allowing clinicians to connect distant abscesses to their device-related sources more rapidly.

For the broader medical community, the case serves as a reminder that foreign body infections can have consequences far beyond the site of implantation. The authors conclude that recurrent endotipsitis may lead to serious complications in distant organs, and their patient’s brain abscess is the first documented example of this process caused by Klebsiella pneumoniae. The findings suggest that clinicians caring for patients with TIPS stents should maintain a high index of suspicion for endotipsitis when unexplained sustained sepsis develops, and should consider the possibility of metastatic infection when evaluating such patients. The case also adds to the evidence that prolonged antimicrobial therapy, while not a substitute for definitive source control, can achieve remission in some patients, offering a pragmatic approach when transplantation is not immediately feasible. As the population of patients with TIPS stents continues to grow, understanding the full spectrum of endotipsitis and its distant complications will become increasingly important for preventing severe outcomes such as invasive brain abscess.

Subject of Research: Infectious Diseases

Article Title: Invasive Klebsiella pneumoniae brain abscess due to endotipsitis: a case report

Article References: Chang, Y., Wang, H., Liu, E., Li, H., & Ni, Z. (2026). Invasive Klebsiella pneumoniae brain abscess due to endotipsitis: a case report. BMC Infectious Diseases. https://doi.org/10.1186/s12879-026-14573-z

Image Credits: AI Generated

DOI: 10.1186/s12879-026-14573-z

Keywords: endotipsitis, Klebsiella pneumoniae, brain abscess, TIPS, sepsis, bacteremia, metagenomic next-generation sequencing, infectious diseases, Invasive, Klebsiella, pneumoniae, brain