ABSTRACT

The objective of this systematic review was to select articles including chest X-ray or chest CT findings in patients who developed pulmonary tuberculosis following solid organ transplantation (lung, kidney, or liver). The following search terms were used: "tuberculosis"; "transplants"; "transplantation"; "mycobacterium"; and "lung". The databases used in this review were PubMed and the Brazilian Biblioteca Virtual em Saúde (Virtual Health Library). We selected articles in English, Portuguese, or Spanish, regardless of the year of publication, that met the selection criteria in their title, abstract, or body of text. Articles with no data on chest CT or chest X-ray findings were excluded, as were those not related to solid organ transplantation or pulmonary tuberculosis. We selected 29 articles involving a collective total of 219 patients. The largest samples were in studies conducted in Brazil and South Korea (78 and 35 patients, respectively). The imaging findings were subdivided into five common patterns. The imaging findings varied depending on the transplanted organ in these patients. In liver and lung transplant recipients, the most common pattern was the classic one for pulmonary tuberculosis (cavitation and "tree-in-bud" nodules), which is similar to the findings for pulmonary tuberculosis in the general population. The proportion of cases showing a miliary pattern and lymph node enlargement, which is most similar to the pattern seen in patients coinfected with tuberculosis and HIV, was highest among the kidney transplant recipients. Further studies evaluating clinical data, such as immunosuppression regimens, are needed in order to improve understanding of the distribution of these imaging patterns in this population.

Keywords: Tomography, X-ray computed; Radiography; Tuberculosis, pulmonary; Lung/transplantation; Kidney/transplantation; Liver/transplantation.

RESUMO

O objetivo desta revisão sistemática foi selecionar artigos com achados radiográficos e/ou tomográficos de tórax em pacientes que desenvolveram tuberculose pulmonar após transplante de órgãos sólidos (pulmão, rim ou fígado). Os descritores utilizados para a pesquisa foram: "tuberculosis", "transplants", "transplantation", "mycobacterium" e "lung". As bases de dados utilizadas nesta revisão foram PubMed e Biblioteca Virtual em Saúde. Foram selecionados artigos em inglês, português e espanhol, independentemente do ano de sua publicação, que possuíam em seu título, resumo ou corpo do texto os aspectos selecionados quanto ao objetivo da pesquisa. Foram excluídos artigos sem dados sobre achados de radiografia ou de TC de tórax e aqueles não relacionados com transplantes de órgão sólido ou tuberculose pulmonar. Foram selecionados 29 artigos para o estudo, somando 219 pacientes. As maiores amostras vieram de estudos realizados no Brasil e na Coreia do Sul (78 e 35 pacientes, respectivamente). Os achados de imagem foram subdivididos em cinco padrões mais comuns. Os achados de imagem nesses pacientes variaram dependendo do órgão transplantado. O padrão mais comum foi o clássico para tuberculose pulmonar (escavação e nódulos em árvore em brotamento) nos transplantados de fígado e pulmão, que é similar ao acometimento da doença na população em geral. Transplantados de rim apresentaram um maior número de casos de acometimento miliar e de linfonodomegalia, que é mais similar aos casos de pacientes coinfectados com tuberculose e HIV. Estudos que avaliem dados clínicos, como o esquema farmacológico de imunossupressão, são necessários para um melhor entendimento da distribuição desses padrões de imagem nessa população.

Palavras-chave: Tomografia computadorizada por raios X; Radiografia; Tuberculose pulmonar; Pulmão/transplante; Rim/transplante; Fígado/transplante.

INTRODUCTION

Pulmonary tuberculosis is an infection that is spread by airborne transmission and has a major impact on morbidity and mortality in several countries. In the year 2014, the global incidence of tuberculosis was approximately 133 cases/100,000 population, underdeveloped countries accounting for the majority of those cases, being 281 cases/100,000 population in Africa and approximately 33 cases/100,000 population in Brazil.(1,2)

Pulmonary tuberculosis occurs in two principal forms: primary, responsible for only 5% of cases, in which the inhaled tuberculosis bacillus infects the airway and is not immediately contained by the host immunity; and post-primary, responsible for 95% of cases, in which the principal focus of pulmonary infection is contained by the host immunity, with subsequent reactivation of the disease.

The incidence of pulmonary tuberculosis can be up to 20 times higher among recipients of solid organ transplants than among immunocompetent individuals in areas where tuberculosis is not endemic.(3,4)

The clinical manifestations of pulmonary tuberculosis in immunosuppressed patients, including solid organ transplant recipients, can often be attenuated, the typical signs and symptoms, including fever, productive cough, and night sweats, often being absent, which hinders and delays the correct diagnosis.

For immunosuppressed patients with acute or subacute respiratory symptoms, CT is the imaging modality of choice, often strongly suggesting the diagnostic hypothesis of pulmonary tuberculosis. Many radiological findings have been described in this disease, including the miliary pattern, consolidations, ground-glass attenuation opacities, cavitation with centrilobular "tree-in-bud" nodules, diffuse pulmonary infiltrates, mediastinal or hilar lymph node enlargement, and pleural effusion.(4-6)

There have been few studies reporting the tomographic findings of pulmonary tuberculosis in patients undergoing solid organ transplantation. The objective of the present study was to conduct a systematic review of the literature in order to identify the main radiological patterns of tuberculosis in this population.

METHODS

Search strategies

For this systematic review, we followed the precepts of the Cochrane Handbook for Systematic Reviews of Interventions,(7) which involve formulating the research question; locating and selecting scientific articles; and critically evaluating the articles selected. The research question used was as follows: What are the presentations of pulmonary tuberculosis on chest X-ray and chest CT in solid organ transplant recipients? The research was carried out by five researchers, four of whom carried out the searches for articles in an independent and blinded fashion, whereas the fifth was the reviewer, being consulted in cases of uncertainty in order to reach a consensus. The following search terms were used: "tuberculosis"; "transplants"; "transplantation"; "mycobacterium"; and "lung". Those search terms were selected from the list of descriptors available from the U.S. National Library of Medicine Medical Subject Headings and the Brazilian Descritores em Ciências da Saúde da Biblioteca Virtual em Saúde (Virtual Health Library Descriptors in the Health Sciences). For the research, the following online databases were used: PubMed, which includes Medline and the Cochrane Library; and the Virtual Health Library, which includes LILACS, the Spanish Bibliographic Index of the Health Sciences, and SciELO. The searches were conducted between January and October of 2016.

Selection criteria

We selected articles in English, Portuguese, or Spanish, published between January of 1980 and October of 2017, involving human subjects, in which the title, abstract, or body of the text had some relationship with the study objective. Duplicate articles were excluded, as were those for which abstracts were not available, those that did not contain information on chest X-ray or chest CT findings, and those that were not related to solid organ transplantation or pulmonary tuberculosis. No search filters were applied. The article selection process is depicted as a flow chart in Figure 1, according to the recommendations of the preferred reporting items for systematic reviews and meta-analyses.(8)
 



Data analysis

On the basis of the reading of the abstracts of the studies identified, the full texts of the selected articles were retrieved. After the full texts of the articles had been read, the following data were extracted: author names, year of publication, the country where the research was conducted, sample size, patient age, patient genders, time from transplantation to diagnosis of tuberculosis, transplanted organ, chest CT findings, and chest X-ray findings. The selected articles were divided, by their study design, into case series and case reports.

The results obtained from the evaluation of the selected articles served as the basis for the evaluation of the demographic data related to the patients in the sample and chest imaging data. The chest imaging data were divided into five presentation groups, according to the predominant finding: miliary nodules; cavitation and centrilobular "tree-in-bud" nodular pattern; consolidation and ground-glass attenuation; mediastinal lymph node enlargement; and pleural effusion. This classification followed the criteria established by the Fleischner Society.(9)

For articles that discriminated the presentation of tuberculosis as pulmonary only, without additional details, the chest imaging data were classified as the typical presentation of tuberculosis and were inserted into the cavitation and centrilobular in "tree-in-bud" nodular pattern group, as were those for articles that described small pleural effusion, because the classification was based on the predominant pattern. Three abstracts were excluded because the pulmonary tuberculosis patients evaluated also had pulmonary Kaposi's sarcoma or pulmonary infection.(10-12) Four cases series were excluded for generalizing imaging findings to recipients of more than one solid organ transplant,(13-16) as was one case series for generalizing imaging findings to patients with tuberculosis or other respiratory infections.(17) The demographic data presented in two articles were censored, because they combined groups of interest (thoracic pathologies) with other groups (nonthoracic pathologies).(5,18)

RESULTS

From among the articles involving solid organ transplant recipients with pulmonary tuberculosis, we selected 16 case series(5,18-32) and 13 case reports(33-45) in which chest imaging findings were available, with a collective total of 219 patients. The data had been obtained in countries on all continents. Among the selected studies, the largest patient samples (78 and 35 patients, respectively) were in a study conducted in Brazil and a study conducted in South Korea, as can be seen in Table 1.(26,29,31,32)
 



Pulmonary tuberculosis occurs most commonly in men, who accounted for 65% and 72% of the sample, respectively, in the two most representative studies.(26,29) The majority of patients with pulmonary tuberculosis were between the fourth and sixth decades of life. The diagnosis of pulmonary tuberculosis was made 3-12 months after transplantation (Table 1).

The incidence of tuberculosis cases in relation to the number of transplants of a given organ at each institution ranged from 0.09% to 4.7% of the cases, with a mean incidence of 1.12%. We identified 53 cases of pulmonary tuberculosis among lung transplant recipients, with a predominance of the cavitation/tree-in-bud pattern in 35 (66%) of the cases (Table 2).
 




The largest patient sample was composed of kidney transplant recipients (96 patients); the most common pattern was cavitation and centrilobular nodules in a tree-in-bud pattern, which was seen in approximately one third of those patients, followed by the "lymph node enlargement" and "pleural effusion" categories, which together also accounted for a third of the cases (Table 3). We identified 51 liver transplant recipients, 62% of whom had cavitation and centrilobular nodules in a bud-tree pattern (Table 4).
 

 




DISCUSSION

To our knowledge, this is the first systematic review of chest imaging findings in solid organ transplant recipients diagnosed with pulmonary tuberculosis. A collective total of 219 cases were analyzed. Among the 219 cases analyzed, 96, 70, and 53 were in kidney, liver, and lung transplant recipients, respectively. This proportional distribution of cases of pulmonary tuberculosis probably reflects the similar proportional distribution of transplantations by organ.

In the articles selected (i.e., those that contained imaging findings), the prevalence of tuberculosis among transplant recipients ranged from 0.09% to 4.7%, thus not representing the total number of cases, which was not the purpose of the present study. These proportions allow us to infer only an approximate value for the true prevalence.

The studies with the highest numbers of patients included were conducted in Brazil, South Korea, India, and Iran. It is necessary to emphasize that tuberculosis is endemic only in certain countries, unlike most other opportunistic diseases, which are ubiquitous. The incidence of pulmonary tuberculosis among transplant recipients will always be related to the incidence of tuberculosis in the region in which the patient and donor reside.

Among the patient samples evaluated, there was a predominance of men, with an approximate male:female ratio of 2:1. However, it should be borne in mind that approximately half of the articles did not provide demographic data or extrapolated them to diseases other than tuberculosis and were therefore not included. The majority of the patients were between the fourth and sixth decades of life. A complete evaluation of demographic findings might be more appropriate if all articles on solid organ transplant recipients with tuberculosis were evaluated, rather than only those including chest imaging findings.

Data on the time from transplantation to the diagnosis of tuberculosis were present in approximately half of the studies of lung or kidney transplant recipients and most of those of liver transplant recipientsThe time from transplantation to the diagnosis of tuberculosis ranged from 3 to 11 months for lung transplant recipients, with medians between 3 and 4 months, compared with 8-12 months for kidney transplant recipients and 2.6-12 months for liver transplant recipients.

Approximately 66% of the lung transplant recipients with tuberculosis showed a typical pattern of pulmonary involvement (cavitations and the tree-in-bud pattern), atypical patterns occurring in approximately one third of cases. Unlike the lung transplant recipients, only 34 of the 96 kidney transplant recipients-approximately one third-showed the classic presentation of pulmonary tuberculosis, whereas approximately one quarter showed a miliary presentation and approximately one third showed a predominance of lymph node enlargement or pleural effusion.

Most (76%) of the data obtained for kidney transplant recipients were from CT findings, as were all (100%) of the data obtained for liver transplant recipients. In the latter case, the majority (67.2%) had the typical presentation of pulmonary tuberculosis. None of the liver transplant recipients showed a predominance of pleural effusion.

In patients with tuberculosis/HIV coinfection, pulmonary tuberculosis was found to be most often accompanied by lymph node enlargement and miliary disease.(46) Hilar and mediastinal lymph node enlargement occurred in 60% of such patients.(47,48)

On the basis of our results, we can infer that the presentation of pulmonary tuberculosis in kidney transplant recipients tend to be most similar to that of patients with tuberculosis/HIV coinfection (i.e., a greater proportion of cases of lymph node enlargement and miliary involvement); the same was not true for lung and liver transplant recipients, in whom the presentation tended to be more similar to that seen in the general population.

In the articles selected for this review, there were other presentations of pulmonary tuberculosis not defined in the classification described in the methods section. Boedefeld et al.(35) reported a case of pulmonary tuberculosis accompanied by pericardial involvement. There were also two reported cases of transplant recipients presenting with pulmonary tuberculosis in the form of masses.(39,45)

There were reports of pulmonary tuberculosis in solid organ transplant recipients with normal chest X-rays findings, as well as in healthy patients, with incidence rates that vary widely across studies. Lyu et al.(29) also identified patients with normal chest CT findings who developed pulmonary tuberculosis. Therefore, normal chest X-rays do not exclude a diagnosis of pulmonary tuberculosis in solid organ transplant recipients. The incidence of that combination might be better evaluated in clinical studies of tuberculosis in this population. In a case report, Carlsen et al.(42) stated that the presence of calcified mediastinal lymph nodes can raise the suspicion of a diagnosis of tuberculosis.

In summary, the majority of lung and liver transplant recipients with pulmonary tuberculosis show the classic cavitation and tree-in-bud nodular presentation (66.0 and 67.2%, respectively). However, that presentation is seen in only one third of kidney transplant recipients with pulmonary tuberculosis, in whom the presentation is similar to that seen in patients coinfected with tuberculosis and HIV. Studies evaluating sociodemographic differences and, in particular, the immunosuppressive regimen could help identify new hypotheses for the predominance of the atypical presentation of pulmonary tuberculosis in kidney transplant recipients.

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