Journal List > Korean J Radiol > v.17(2) > 1027213

Yoon, Chung, Lee, Kim, Park, and Koh: Broncho-Pleural Fistula with Hydropneumothorax at CT: Diagnostic Implications in Mycobacterium avium Complex Lung Disease with Pleural Involvement

Abstract

Objective

To determine the patho-mechanism of pleural effusion or hydropneumothorax in Mycobacterium avium complex (MAC) lung disease through the computed tomographic (CT) findings.

Materials and Methods

We retrospectively collected data from 5 patients who had pleural fluid samples that were culture-positive for MAC between January 2001 and December 2013. The clinical findings were investigated and the radiological findings on chest CT were reviewed by 2 radiologists.

Results

The 5 patients were all male with a median age of 77 and all had underlying comorbid conditions. Pleural fluid analysis revealed a wide range of white blood cell counts (410–100690/µL). The causative microorganisms were determined as Mycobacterium avium and Mycobacterium intracellulare in 1 and 4 patients, respectively. Radiologically, the peripheral portion of the involved lung demonstrated fibro-bullous changes or cavitary lesions causing lung destruction, reflecting the chronic, insidious nature of MAC lung disease. All patients had broncho-pleural fistulas (BPFs) and pneumothorax was accompanied with pleural effusion.

Conclusion

In patients with underlying MAC lung disease who present with pleural effusion, the presence of BPFs and pleural air on CT imaging are indicative that spread of MAC infection is the cause of the effusion.

INTRODUCTION

Mycobacterium avium complex (MAC), consisting of 2 species of Mycobacterium avium (M. avium) and Mycobacterium intracellulare (M. intracellulare), is the most common etiologic organism of lung disease caused by nontuberculous mycobacteria (NTM) (12). The prevalence of MAC lung diseases is increasing worldwide (3456). The traditionally recognized clinical presentation of MAC lung disease is apical fibrocavitary disease. This type of disease usually develops in older males with a history of lung disease, such as previous pulmonary tuberculosis (TB) (7). MAC lung disease can also present with nodular infiltrates, frequently involving the right middle lobe and the lingular segment of the left upper lobe. This form of disease is termed nodular bronchiectasis and occurs predominantly in postmenopausal, non-smoking females (8910).
Although some of the clinical and radiographic features of NTM lung disease resemble those of pulmonary TB, NTM infection is rarely accompanied by pleural involvement (11). Pleural TB develops from pulmonary lesions that form a small subpleural TB focus. Mycobacterial antigens enter the pleural space and interact with T-cells previously sensitized to mycobacteria, resulting in acute inflammation and exudation caused by a delayed hypersensitivity reaction (1213). Chest computed tomography (CT) frequently shows that subpleural parenchymal lesions are associated with TB pleurisy (1415).
However, pleural disease is not often found and pleural effusion is rare in NTM lung disease (2). Christensen et al. (16) examined the initial radiographic appearance of 100 cases of MAC lung disease. Only 6% of cases had a defined edge of pleural thickening or fluid blunting of the lateral or posterior costophrenic sulcus. Lynch et al. (17) reported on the CT features of 55 cases of MAC lung disease and found that only 7% of cases had pleural calcification. There have been a few case reports on pleural effusion associated with MAC lung disease in the English literature (18192021). Here, we presented 5 cases of pleural hydropneumothorax associated with MAC lung disease, and suggest a possible mechanism for the development of pleural effusion in patients with MAC lung disease through the CT findings.

MATERIALS AND METHODS

Study Subjects

This study protocol was approved by the Institutional Review Board of Samsung Medical Center. Informed consent was waived due to the retrospective nature of this study. Using the mycobacterial laboratory database, we identified and reviewed the medical records of 6 consecutive patients of Samsung Medical Center (a 1961-bed referral hospital in Seoul, Korea) who had MAC culture-positive pleural fluid samples between January 2001 and December 2013. One patient who developed MAC culture-positive pleural effusion as a post-operative complication after resectional surgery for MAC lung disease was excluded. Consequently, 5 patients were ultimately included in the study.
During the study period, MAC species were identified using a polymerase chain reaction-restriction fragment length polymorphism method based on the rpoB gene, as previously described (222324). All patients fulfilled the diagnostic criteria set forth by the American Thoracic Society/Infectious Diseases Society of America in 2007 (2). Clinical data for 1 patient was published in a 2006 case report (20).
All data for the patients, which included age, sex, past history of pulmonary TB, underlying comorbid conditions and gross findings of pleural fluid were drawn from patient charts. Blood laboratory findings, such as the levels of total protein, lactate dehydrogenase (LDH), glucose, and white blood cell (WBC) count were reviewed. Pleural fluid examination included WBC count with the proportion of neutrophils and lymphocytes, the levels of total protein, LDH, glucose and adenosine deaminase (ADA). Microbiological findings, such as the causative microorganisms, were also reviewed.

Image Acquisition and Analysis

All CT examinations were performed using various helical CT scanners (Light SpeedVCT and Discovery CT750 HD, GE Healthcare, Chalfont St. Giles, England; Brilliance 40, Philips, Best, the Netherlands; Aquilion, Toshiba, Tokyo, Japan). CT scans (114–210 mA, 120 kVp, beam width of 10–20 mm, beam pitch of 1.375–1.5) were obtained from the lung apices to the level of the middle portion of both kidneys. The image data were reconstructed with a section thickness of 2.5–5 mm using a bone algorithm. The reconstructed images were then interfaced directly with a picture archiving and communication system (Centricity 2.0; GE Healthcare, Mt. Prospect, IL, USA), which displayed all image data on 2 monitors (1536 × 2048 matrix, 8-bit viewable gray scale, and 60-ft-Lambert luminescence). Both mediastinal (width, 400 Hounsfield unit [HU]; level, 20 HU) and lung (width, 1500 HU; level, -700 HU) window images were viewed on these monitors.
Two chest radiologists, blinded to all clinical information other than that the patients had MAC culture-positive pleural fluid, jointly assessed the CT images and decisions on CT findings were reached by consensus (with 5 and 22 years of experience in chest CT interpretation, respectively). The presence of all parenchymal abnormality patterns in each lobe (6 lobes: right upper lobe, right middle lobe, right lower lobe, upper division of left upper lobe, lingular division of left upper lobe, and left lower lobe) was recorded. The assessed patterns of parenchymal abnormalities included: nodule (10–30 mm in diameter), tree-in-bud opacity (small centrilobular nodules < 10 mm in diameter and branching nodular structures), consolidation (lobular, segmental, or peribronchial), cavities (single or multiple regardless of their size or wall thickness), bronchiectasis, and lobar volume decrease. Lobular consolidation was defined as a consolidative lesion of 0.5–3.0 cm in size, polygonal in shape, and with a subpleural location. Segmental consolidation was defined as a larger pleural-based consolidative lesion with a polygonal appearance rather than lobular consolidation. Peribronchial consolidation was defined as a consolidative lesion distributed along the bronchovascular bundles. A lobar volume decrease was regarded as present when a lobe contained crowded bronchovascular bundles, peribronchial reticulation, and bronchial dilatation with a distorted and displaced fissure (25). The extent of the parenchymal abnormality was estimated by counting the number of lobes involved. The laterality (unilateral or bilateral) of lung lesions was also analyzed. The site (right or left), presence of a broncho-pleural fistula (BPF) and pleural thickening were assessed for hydropneumothorax. BPFs are direct communications between the pleural space and the bronchial tree or lung parenchyma (26). Additionally, the time interval between the presence of the hydropneumothorax on the CT scan and the initial parenchymal NTM diagnosis was recorded.

RESULTS

The clinical findings from the 5 MAC culture-positive patients with pleural effusions were shown in Table 1. The median age was 77 years (range 56–86 years) and all were male. Three patients had a history of pulmonary TB treatment and all patients had underlying comorbid diseases that included chronic obstructive pulmonary disease, diabetes mellitus, rheumatoid arthritis, liver cirrhosis and prostate cancer. In blood laboratory tests, the WBC counts were in the normal range, and the nutritional status, reflected by the measured protein level, was also in the normal range in all patients. The level of fasting glucose was mildly elevated in 1 patient. With respect to the microbiological findings in pleural fluids, the causative microorganisms consisted of M. avium in 1 patient and M. intracellulare in 4 patients. Pleural fluid analysis revealed variable WBC counts (410–100690/µL) with various proportions of neutrophils (15–100%). The levels of LDH and ADA were elevated (56.3–206.6 IU/L) in the 3 patients from whom samples were available.
Among the 5 patients who underwent chest CT, all had abnormal parenchymal lesions representative of MAC lung disease. Table 2 presented a summary of the abnormal chest CT findings in the 5 patients. The tree-in-bud pattern was seen in 3 patients (60%) and segmental or peribronchial consolidation and bronchiectasis with lobar or segmental volume loss causing lung destruction was present in all patients (100%). Cavitary lesions were present in 4 patients (80%). Bilateral involvement of lung lesions was observed in 3 patients (60%). Hydropneumothorax accompanied by pleural thickening was observed in all patients. Two radiologists reviewed the findings with respect to the presentation of pleural effusions as hydropneumothorax, particularly for the presence of a BPF. The finding was that all patients had ≥ 1 BPFs related to hydropneumothorax (Figs. 1, 2). The time interval between the presence of a hydropneumothorax on CT and the initial parenchymal NTM diagnosis in 3 of the patients ranged from 36–89 months; however, in the remaining 2 patients, the hydropneumothorax was present at the time of initial diagnosis of MAC lung disease.

DISCUSSION

The significant findings of this study were as follows: 1) all patients with complications involving hydropneumothorax were male and had underlying comorbid disease; 2) most pleural fluid samples had higher leukocyte counts with predominant neutrophils and high LDH levels suggestive of empyema; 3) most patients had extensive pulmonary lesions and multiple cavities or bronchiectasis due to MAC lung disease; 4) all patients had ≥ 1 BPFs associated with hydropneumothorax in CT; 5) these MAC lung disease with hydropneumothorax are extremely rare in our 13-year single-tertiary center experience. Based on the results of this study, it is possible that the development of hydropneumothorax with BPFs is related to the coexistence of MAC lung disease.
Mycobacterial pleurisy is a common etiology of lymphocyte-rich pleural effusion, and is commonly caused by Mycobacterium tuberculosis (27). In contrast, NTM pleurisy is uncommon, with only a few cases based on diverse diagnostic criteria reported in the literature (18192021). With the increasing prevalence of NTM disease (3456), NTM pleurisy has become a clinical concern. Thus, in patients with MAC lung disease who present with pleural effusion, differentiation between NTM pleurisy and other superimposed infection (e.g., TB pleurisy or bacterial exudate) is important. During the 13-year study in this hospital, MAC was isolated from pleural effusion in only 5 patients with MAC lung disease. In this study, the patients with MAC pleurisy had higher leukocyte counts in their pleural effusions than did patients with known TB pleurisy, possibly due to differences in the nature of the micro-organisms. Previous studies on MAC pleurisy have reported neutrophil predominant pleural effusion and high LDH levels (2028).
Although, the pathway leading from NTM infection to pleural empyema is currently unclear, 2 theories are proposed (29); first, the development of the empyema from the lung infection and second, the development of the pleural effusion after minor trauma. The CT imaging findings in this study clearly demonstrated BPFs and loculated hydropneumothorax. These findings suggested that in our cases, the pleural effusion resulted from pulmonary parenchymal infection through BPFs, as previously suggested (29). While BPFs associated with TB usually follow a surgical procedure, they can also occur spontaneously (3031). Our study suggested that the fibro-bullous or fibro-cavitary changes caused by previous MAC lung disease play a potential role in the development of BPFs and subsequent pleural effusion due to MAC infection. This assumption was supported by 3 of our cases (case no. 2, 4, and 5), which showed the slowly progressive of nature of MAC lung disease (1032), resulting in hydropneumothorax months or years after the initial diagnosis. Therefore, BPFs can be a sign for distinguishing from other secondary exudates.
In a recent Taiwanese study (33) on 35 patients with NTM pleurisy, only 3 patients had pulmonary involvement (3/35, 8.6%) unlike our study finding, possibly due to more severe underlying comorbid condition (e.g., malignancy or immune dysfunction) and younger median age of the population (51.2 years) than that of our study (77 years). Furthermore, non-MAC NTM species were isolated in 19 patients in the Taiwanese study; whereas, only MAC species were found in our study. However, the possible pathogenic mechanism of NTM pleurisy in Taiwan is unclear and may differ from our assumption. Patient cohorts with different local epidemiologic features in Taiwan must be investigated in order to better understand the pathogenesis of NTM pleurisy.
Previous studies have indicated that malnutrition, impaired cellular immunity, apparently abnormal microvascular circulation due to diabetes mellitus (18) and surgical treatment (34) may enhance the development of pleuritis in patients with underlying MAC infections. In our study, the patients also had comorbid conditions. Not all, but some of these cases may have been affected by these comorbid diseases, resulting in underlying fibro-bullous or fibro-cavitary changes, which may provide a possible explanation for the progression of MAC disease and ultimately the development of pleural empyema.
Our study had several limitations. First, as this was a retrospective study, the number of patients with MAC infections may have been underestimated. For mycobacterial culture, liquid culture media reportedly result in higher yields and faster results than solid media. At our institution, a liquid culture-based method (mycobacterial growth indicator tube [MGIT]; Becton-Dickinson and Co., Sparks, MD, USA) was introduced in January, 2009 (35). Therefore, patients with pleural effusion who had culture-positive MAC may have had more advanced MAC lung disease, particularly in the early study period. Second, due to the small number of cases, no firm conclusions can be drawn, and a large-scale prospective study is needed.
In conclusion, all 5 patients with underlying MAC lung disease and culture-positive MAC pleural effusion had fistulous communication between the pulmonary NTM lesions and the pleural space. Thus, in patients with underlying MAC lung disease who present with pleural effusion, the presence of BPFs and pleural air on CT imaging is indicative that the spread of MAC infection is the cause of the effusion.

Figures and Tables

Fig. 1

Chest radiograph and CT images obtained from 86-year-old man with pulmonary disease and hydropneumothorax caused by Mycobacterium avium (Case 4).

A. Chest radiography shows hydropneumothorax (arrow) in right hemithorax. Small cavitary or non-cavitary nodules and branching nodular structures (tree-in-bud pattern) (arrowheads) are seen in both lungs. B. CT images with lung and mediastinal window setting demonstrate hydropneumothorax and enhancing pleural thickening suggesting pleural empyema. Note broncho-pleural fistulas (arrow) that developed from prior cavitary lesion (not shown) in same area.
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Fig. 2

CT images showing broncho-pleural fistula (arrows) in each case with hydropneumothorax associated with Mycobacterium avium complex lung disease (A–D, Cases 1–3, and 5, respectively).

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Table 1

Clinical Characteristics of Patients with MAC Lung Disease with Pleural Involvement

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Case 1 Case 2 Case 3 Case 4 Case 5
Sex/age Male/56 Male/77 Male/61 Male/86 Male/77
Etiologic organism M. intracellulare M. intracellulare M. intracellulare M. avium M. intracellulare
Previous tuberculosis treatment Yes Yes Yes No No
Underlying comorbid condition COPD Diabetes mellitus Rheumatoid arthritis Liver cirrhosis Prostate cancer
Gross findings of pleural fluid Serosangineous Pus-like Turbid Serous Serous
Laboratory test, blood
 WBC, /µL 9830 7262 8750 8240 9920
 Protein, g/dL 6.3 7.5 6.7 7.7 6.6
 LDH, IU/L 432 358 - 728 1408
 Glucose 76 100 116 102 89
Laboratory test, pleural fluids
 WBC, /µL 46870 NA 100690 1910 410
 Neutrophil (%) 100 NA 93 15 60
 Lymphocyte (%) 0 NA 0 23 24
 Protein, g/dL NA NA 5.318 5.357 2.242
 LDH, IU/L NA NA 8683 1688 1624
 Glucose, mg/dL NA NA 4 74 17
 ADA, IU/L 146 NA 206.6 140.5 56.3

ADA = adenosine deaminase, COPD = chronic obstructive pulmonary disease, LDH = lactate dehydrogenase, M. avium = Mycobacterium avium, M. intracellulare = Mycobacterium intracellulare, MAC = Mycobacterium avium complex, NA = not available due to high viscosity of pleural fluid, WBC = white blood cell

Table 2

CT Findings from Patients with MAC Lung Disease with Pleural Involvement

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Case 1 Case 2 Case 3 Case 4 Case 5
Lung
 Nodules (-) (+) (-) (+) (+)
 Tree-in-bud pattern (-) (+) (-) (+) (+)
 Lobular consolidation (+) (-) (-) (+) (+)
 Segmental or peribronchial consolidation (+) (+) (+) (+) (+)
 Extent of lesion (No. of involved lobes)* 3 5 1 6 6
 Laterality Unilateral (left) Bilateral Unilateral (left) Bilateral Bilateral
 Cavity (+) (+) (-) (+) (+)
 Bronchiectasis (+) (+) (+) (+) (+)
 Volume loss (+) (+) (+) (+) (+)
Pleura
 Site Left Left Left Right Right
 Presence of hydropneumothorax (+) (+) (+) (+) (+)
 Presence of BPF (+) (+) (+) (+) (+)
 Pleural thickening (+) (+) (+) (+) (+)
 Duration between initial diagnosis and presence of hydropneumothorax (month) 0 36 0 64 89

*Total of six lobes in each patient's lung (lingular segment was considered as separate lobe) were assessed. BPF = broncho-pleural fistula, MAC = Mycobacterium avium complex

Notes

This research was supported by a grant of the Korea Health technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (HI15C2778).

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