Adrenal gland infection is an important but largely unrecognized clinical entity. It can be caused by a wide variety of pathogens that include fungi, viruses, parasites, and bacteria [1]. Immunocompromised individuals are at a higher risk for primary infection of the adrenal glands or infection due to disseminated disease [1]. Standard treatment of intra-abdominal abscesses, including adrenal abscesses, currently consists of antibiotic therapy and percutaneous image-guided drainage techniques, such as ultrasound or tomography [2]. However, percutaneous drainage can be difficult due to the interposition of the liver, lung, pleura, or intestinal segments, making surgical drainage necessary. Nevertheless, surgical drainage is an invasive procedure that should be avoided in immunosuppressed patients presenting with infections, in patients with multiple comorbidities, and in patients who are hemodynamically unstable, given that it could increase morbidity and mortality [3]. In selected cases, the interventional technique of endoscopic ultrasound (EUS) enables the puncture and drainage of collections in patients in whom percutaneous treatment is difficult or unfeasible [4].

A 15-year-old female, with a history of recurrent furunculosis since infancy, arrived at the emergency department because of abdominal pain in the epigastrium and left hypochondrium with a 2-month progression, associated with nausea and vomiting. One week earlier, she presented with a spiking fever and pronounced malaise. Upon admission, the patient’s general condition was poor. Physical examination identified low blood pressure, tachycardia, and abdominal tenderness, with no signs of peritoneal irritation, and oral cavity examination revealed whitish plaques, consistent with oropharyngeal candidiasis. The patient was transferred to the special care unit, where crystalloid resuscitation and vasopressor support with norepinephrine were initiated. The initial tests reported normocytic normochromic anemia, lymphopenia, mild thrombocytopenia, elevated C-reactive protein (27 mg/dL), hyperlactatemia, and compromised liver function, with ALT 357 U/L, AST 309 U/L, and hyperbilirubinemia. Taking the physical examination findings and the initial laboratory test abnormalities into account, an ELISA HIV test was performed. The result was positive, with an elevated viral load (63,626 copies) and a CD4 lymphocyte count of 32. Due to the marked inflammatory response, blood cultures were carried out and antibiotic therapy with vancomycin and meropenem was empirically initiated. An abdominal ultrasound study identified hepatosplenomegaly and free fluid in the lesser sac. Complementary contrast-enhanced abdominal magnetic resonance imaging showed multiple round millimetric liver lesions consistent with micro-abscesses, along with findings in the left adrenal gland consistent with a collection that was not amenable to percutaneous drainage (Fig. 1A). Methicillin-resistant Staphylococcus aureus (MRSA) growth was observed in blood cultures. After 72 hours of treatment with intravenous antibiotics, the symptoms persisted with signs of systemic inflammatory response and positive blood cultures. Infectious endocarditis was ruled out through transesophageal echocardiogram and, given that there were no other collections amenable to drainage, the decision was made to drain the abscess in the left adrenal gland.

Endoscopic ultrasonography was performed with the patient under general anesthesia. Using a linear endoscope, the transgastric puncture was made with a 19G needle (Expect needle^TM; Boston Scientific, Marlborough, MA, USA), and 20 mL of pus was sent for microbiological analysis. The area was washed out with the same quantity of saline solution at 0.9% until the drainage was clear (Fig. 1B-1D).

After drainage, the general status of the patient improved with modulation of the inflammatory response. Vasopressor support was suspended 2 days after drainage, and the control blood cultures were negative. The patient was discharged 1 week after the transgastric drainage, and she completed a 6-week outpatient parenteral antimicrobial drug therapy with vancomycin. The cultures obtained from the purulent drained fluid were positive for MRSA, ruling out other opportunistic infections, such as tuberculosis, fungi, and parasites. Follow-up was done during the outpatient parenteral treatment and 12 weeks after discharge with no symptom relapse. Due to the successful clinical outcomes, we did not consider follow-up images after aspiration.

Adrenal glands can be compromised in HIV patients through several routes, including direct infection, opportunistic infection at that level, and alterations related to anti-retroviral medications. The most frequent causes of adrenal involvement in HIV are cytomegalovirus, Mycobacterium tuberculosis, Cryptococcus neoformans, Histoplasma capsulatum, Pneumocystis jirovecii, and Toxoplasma gondii, which are opportunistic pathogens that are usually associated with adrenal insufficiency. On the other hand, bacteria can affect the adrenal glands by direct infection and tissue damage or by exotoxin and endotoxin production [1]. Waterhouse-Friderichsen syndrome is described as a rapidly progressing entity, in which sepsis induces bilateral adrenal hemorrhage. The germs related to sepsis and compromised adrenal glands are N. meningitidis, H. influenza, pneumococcus, P. multocida, K. oxytoca, and S. aureus, among others, but are rarely isolated in the adrenal glands in autopsies of these patients [1].

In general, intra-abdominal abscesses tend to be severe infectious entities. The treatment included long-term antibiotic therapy and drainage to control the inoculum. Regarding adrenal gland infections, simple percutaneous drainage through aspiration, especially in pediatric populations, has been described with good clinical results in case reports [5-7]. In the subphrenic location, the percutaneous approach continues to be the method of choice, but it is known that those collections can be near the lungs, pleura, liver, and intestines, which can affect visualization or make drainage risky [3,8,9]. In this context, the use of minimally invasive methods, such as EUS, can be of diagnostic value in determining the cause, as well as being therapeutic through puncture and aspiration. We found no cases of EUS-guided puncture and drainage of adrenal abscesses in our review of the literature. In our case, we underlined the fact that we performed the puncture with drainage and washout, with no need for a permanent catheter in place.

On the other hand, the patient met all three criteria for outpatient parenteral antimicrobial drug therapy implementation. The patient had an active infectious disease that required continued treatment beyond the anticipated period of hospitalization. Other than the treatment of the infectious disease, there was no need for further hospitalization. Finally, there were no equally effective and safe oral antimicrobial regimens [10].

We conclude that adrenal gland infections are still not widely recognized, but the possible benefits of their early recognition and intervention, especially when they involve fungal pathogens or bacteria, justify having a high clinical suspicion, especially in systemic infections [11]. Simple EUS-guided drainage of the adrenal gland is less invasive and can be safer in immunosuppressed individuals than in other drainage methods.