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Case Report

Case Report: Tuberculosis IRIS : a mediastinal problem

[version 1; peer review: 3 approved]
PUBLISHED 18 Feb 2013
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Abstract

We present a case of a 39-year-old male patient with Acquired Immune Deficiency Syndrome (AIDS) who developed Mycobacterium tuberculosis related Immune Reconstitution Inflammatory Syndrome (IRIS) after initiation of Highly Active Antiretroviral Therapy (HAART) treatment. The inflammatory response resulted in mediastinal necrotic lymphadenopathy and subsequent perforation of the esophageal wall.

Keywords

Mycobacterium tuberculosis, Immune Reconstitution Inflammatory Syndrome, HAART

Presentation

A 39 year-old man with a history of Acquired Immune Deficiency Syndrome (AIDS) presented to the emergency room with fever, productive cough, fatigue, diarrhea, and weight loss. Three weeks prior, he had been initiated on antiretroviral therapy (ART) with darunavir, ritonavir and combination tenofovir and emtricitabine. At that time, he had a CD4 count of 85 cells/μL (9%) and HIV-1 viral load of 336,950 RNA copies/mL. He was now febrile (41.0°C), with a heart rate of 100 beats/min and respiratory rate of 24/min. Physical examination revealed oral thrush and palpable cervical, supraclavicular and axillary lymphadenopathy. His laboratory evaluation was significant for a CD4 count of 28 cells/uL (10%), HIV-1 viral load of 3,410 RNA copies/mL, and hemoglobin of 6.6 g/dL. Chest radiograph on admission (not shown) demonstrated a 2.9 × 4.4 cm soft tissue mass in the anterior mediastinum.

The initial computed tomography (CT) scan of the chest showed low-attenuation, multiple mediastinal lesions, indicative of abscesses or necrotic lymphadenopathy (Figure 1), as well as esophageal discontinuity in the subcarinal region, a sign of esophageal fistula or perforation (Figure 2). Multiple cavitary lung nodules were also present (Figure 3).

7ee08733-026f-4d7f-96aa-f2524ff5c957_figure1.gif

Figure 1. Contrast-enhanced CT scan of the chest on admission revealed multiple low-attenuation necrotic lymph nodes (free-hand-circle) and gas-containing mediastinal collection, representing a mediastinal abscess (arrow).

7ee08733-026f-4d7f-96aa-f2524ff5c957_figure2.gif

Figure 2. Chest CT on admission revealed esophageal discontinuity in the subcarinal region representing esophageal perforation (arrow).

7ee08733-026f-4d7f-96aa-f2524ff5c957_figure3.gif

Figure 3. Chest CT on admission revealed multiple cavitary and non-cavitary lung nodules (arrows), suspicious for mycobacterial infection.

Diagnosis

Mediastinoscopy revealed purulent fluid drainage from necrotic lymph nodes. An esophagogastroduodenoscopy (EGD) demonstrated a 2 cm linear tear in the esophagus with proximal perforation at 29–31 cm level.

The mediastinal fluid was found to be 4+ acid-fast bacilli (AFB) smear positive. PCR of the mediastinal fluid was also positive for Mycobacterium tuberculosis (MTB) complex. In addition, the patient’s blood culture also grew MTB. The clinical presentation, recent initiation of ART, current 2-log decrease in viral load, and thoracic CT findings suggested a diagnosis of unmasking MTB immune reconstitution inflammatory syndrome (IRIS).

Discussion

IRIS, previously known as immune restoration disease (IRD) and immune reconstitution syndrome (IRS) is a paradoxical deterioration in the clinical status of a patient after initiation of antiretroviral therapy1,2. The pathophysiology is related to the inflammation that occurs when the recovered immune system targets either live microorganisms or antigens from dead microorganisms37. Although recently proposed criteria for IRIS differ slightly, most criteria include the evidence of a recovered immune system along with a decrease in HIV viral load and/or increase in CD4 cell count. IRIS may occur as a paradoxical worsening of a known disease that has been under control with treatment, or an unmasking of a previously unsuspected disease4. Common pathogens associated with IRIS include tuberculous and non-tuberculous mycobacteria, cytomegalovirus, Pneumocystis jirovecii, JC virus, Cryptococcus neoformans, herpes simplex virus, hepatitis B virus, hepatitis C virus and Kaposi's sarcoma4,5. Non-infectious diseases such as sarcoidosis, Grave’s disease and thrombotic thrombocytopenic purpura have also been described8. While IRIS can occur acutely or up to 18 months after initiation of ART, most cases occur within the first two weeks to two months after initiation. IRIS is more likely to occur in the setting of high viral loads and low CD4 counts at the time of initiation of ART911.

In pre- and early Highly Active Antiretroviral Therapy (HAART) studies, the most common cause of lymphadenopathy (as seen on imaging) for an HIV patient with a CD4 count less than 50 cells/μL is mycobacterial infection12. Determining the presence of IRIS is not always straightforward; however, several key features help support correct diagnosis. The most common imaging feature in MTB-IRIS includes lymph node enlargement with central necrosis, most commonly located in the abdominal, axillary and mediastinal distributions13. The marked mediastinal lymphadenopathy in our patient is of particular interest, as this is common in patients with MTB-related IRIS14.

This patient initiated ART with a low CD4 count of 85 cells/uL (9%) and a high HIV viral load of 336,950 RNA copies/mL. After initiation of ART, his viral load decreased by 2 logs to 3,410 RNA copies/mL.

The exaggerated immune response to our patient’s mediastinal mycobacterial burden resulted in extension of inflammation from necrotic lymphadenopathy to the esophageal wall, which underwent necrosis and perforation. This resulted in a gas collection replacing the necrotic lymph nodes (Figure 1). Esophageal perforation can occur from extensive coughing and retching in an MTB patient, with or without an underlying infectious esophagitis.

Management

Although definitive management of IRIS has not been established by carefully controlled studies, current management may include the addition of corticosteroids and, in severe cases, temporarily withholding ART. Future management may include evaluation for a combination of cytokines and inflammatory markers such as interleukin 7, interleukin 6 and/or C-reactive protein to predict who is at higher risk of developing IRIS, which can be assessed prior to initiation of ART15,16. Future therapies may include immunomodulatory medications (C-C chemokine receptor 5 inhibitors, TNF antagonists or interleukin 6 receptor inhibitors) to temper the vigorous immune reconstitution16.

Our patient had a complicated hospitalization including recurrent pneumothoraces (Figure 4), empyema, and unmasking of cutaneous Kaposi sarcoma. The esophagus in an HIV patient is particularly vulnerable to pathology. Our case illustrates a mediastinal infectious process in which TB-IRIS was the etiology and causative factor for an esophageal perforation that further complicated the treatment of this patient with AIDS.

7ee08733-026f-4d7f-96aa-f2524ff5c957_figure4.gif

Figure 4. Sequential chest CT studies.

(A) Multiple cavitary and non-cavitary lung nodules (same as Figure 3). (B) Hospital day 6: increased pulmonary tree-in-bud nodules and consolidations, new small right-sided pneumothorax (arrowhead), and new esophageal stent (arrow). (C) One month follow-up: nearly-resolved pulmonary opacities decreased tiny right pneumothorax, and removal of esophageal stent.

Consent

Written informed consent for publication of clinical details and clinical images was obtained from the patient.

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Version 2
VERSION 2 PUBLISHED 18 Feb 2013
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CITE
how to cite this article
Valentin L, DiNardo A, Chiao E et al. Case Report: Tuberculosis IRIS : a mediastinal problem [version 1; peer review: 3 approved]. F1000Research 2013, 2:54 (https://doi.org/10.12688/f1000research.2-54.v1)
NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article.
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Open Peer Review

Current Reviewer Status: ?
Key to Reviewer Statuses VIEW
ApprovedThe paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approvedFundamental flaws in the paper seriously undermine the findings and conclusions
Version 1
VERSION 1
PUBLISHED 18 Feb 2013
Views
14
Cite
Reviewer Report 12 Jun 2013
Paul Klenerman, Nuffield Department of Clinical Medicine, University of Oxford, Headington, Oxford, UK 
Approved
VIEWS 14
This is an interesting short case report and the images are striking.

A couple of points:
  • The actual therapy for this patient was not described in any detail.
  • The timing of therapy for TB/HIV disease could be discussed.
  • The evidence for use of anti-inflammatory
... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Klenerman P. Reviewer Report For: Case Report: Tuberculosis IRIS : a mediastinal problem [version 1; peer review: 3 approved]. F1000Research 2013, 2:54 (https://doi.org/10.5256/f1000research.305.r998)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
Views
11
Cite
Reviewer Report 15 May 2013
Susana N. Asin, Department of Microbiology and Immunology, Dartmouth Medical School, Hanover, NH, USA 
Approved
VIEWS 11
This is an interesting case report, about a mediastinal manifestation of unmasking Tuberculosis Immune Reconstitution Inflammatory Syndrome (IRIS). Specific remarks are:

1- Since the optimal time to start ARV in the course of anti-tuberculosis treatment is unclear detailed comments about case ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Asin SN. Reviewer Report For: Case Report: Tuberculosis IRIS : a mediastinal problem [version 1; peer review: 3 approved]. F1000Research 2013, 2:54 (https://doi.org/10.5256/f1000research.305.r953)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
  • Author Response 16 Jun 2013
    Leonardo Valentin, Baylor College of Medicine, USA
    16 Jun 2013
    Author Response
    Thank you for your review Dr. Asin. See below for our response:
    • The patient had been inconsistently receiving anti-retroviral treatment since his diagnosis of HIV 10 years ago. Three weeks after
    ... Continue reading
COMMENTS ON THIS REPORT
  • Author Response 16 Jun 2013
    Leonardo Valentin, Baylor College of Medicine, USA
    16 Jun 2013
    Author Response
    Thank you for your review Dr. Asin. See below for our response:
    • The patient had been inconsistently receiving anti-retroviral treatment since his diagnosis of HIV 10 years ago. Three weeks after
    ... Continue reading
Views
8
Cite
Reviewer Report 14 Mar 2013
Eric Daar, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA 
Approved
VIEWS 8
This is an interesting case report of a somewhat novel manifestation of TB IRIS.  The comments related to IRIS are relevant and of some value.  Minor comments include:
  • The discussion under management probably should at least raise the importance of  continuing
... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Daar E. Reviewer Report For: Case Report: Tuberculosis IRIS : a mediastinal problem [version 1; peer review: 3 approved]. F1000Research 2013, 2:54 (https://doi.org/10.5256/f1000research.305.r836)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
COMMENTS ON THIS REPORT

Comments on this article Comments (0)

Version 2
VERSION 2 PUBLISHED 18 Feb 2013
Comment
Alongside their report, reviewers assign a status to the article:
Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions
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