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  Table of Contents    
REVIEW ARTICLE
Year : 2017  |  Volume : 34  |  Issue : 2  |  Page : 160-166  

Diagnosis and management options in malignant pleural effusions


1 Department of Respiratory Medicine, J.L.N. Medical College, Ajmer, Rajasthan, India
2 Department of Internal Medicine, J.L.N. Medical College, Ajmer, Rajasthan, India
3 Department of Radiation Oncology, J.L.N. Medical College, Ajmer, Rajasthan, India

Date of Web Publication1-Mar-2017

Correspondence Address:
Ramakant Dixit
Department of Respiratory Medicine, J.L.N. Medical College, Ajmer, Rajasthan
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-2113.201305

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   Abstract 

Malignant pleural effusion (MPE) denotes an advanced malignant disease process. Most of the MPE are metastatic involvement of the pleura from primary malignancy at lung, breast, and other body sites apart from lymphomas. The diagnosis of MPE has been traditionally made on cytological examination of pleural fluid and/or histological examination of pleural biopsy tissue that still remains the initial approach in these cases. There has been tremendous advancement in the diagnosis of MPE now a day with techniques i.e. characteristic Ultrasound and computed tomography features, image guided biopsies, fluorodeoxyglucose-positron emission tomography imaging, thoracoscopy with direct biopsy under vision, tumor marker studies and immunocytochemical analysis etc., that have made possible an early diagnosis of MPE. The management of MPE still remains a challenge to pulmonologist and oncologist. Despite having various modalities with better tolerance such as pleurodesis and indwelling pleural catheters etc., for long-term control, all the management approaches remain palliative to improve the quality of life and reduce symptoms. While choosing an appropriate management intervention, one should consider the clinical status of the patient, life expectancy, overall cost, availability and comparative institutional outcomes, etc.

Keywords: Malignancy, pleural effusion, pleurodesis, thoracoscopy


How to cite this article:
Dixit R, Agarwal K C, Gokhroo A, Patil CB, Meena M, Shah NS, Arora P. Diagnosis and management options in malignant pleural effusions. Lung India 2017;34:160-6

How to cite this URL:
Dixit R, Agarwal K C, Gokhroo A, Patil CB, Meena M, Shah NS, Arora P. Diagnosis and management options in malignant pleural effusions. Lung India [serial online] 2017 [cited 2017 Jul 20];34:160-6. Available from: http://www.lungindia.com/text.asp?2017/34/2/160/201305


   Introduction Top


Malignancy is the most common manifestation of the pleural involvement by advanced malignant disease occurring in approximately half of all patients with metastatic carcinomas. About two-third of malignant pleural effusions (MPE) are secondary to lung cancers, breast cancers and lymphomas. Next to these sites is ovarian carcinoma followed by other malignancies. In about 6% of these patients, the primary site is not identified.[1]

Involvement of pleura in the malignant tumor can occur directly or indirectly. The direct involvement of pleura results from the several mechanism that includes pleural metastasis with increased permeability, pleural metastasis with obstruction of pleural lymphatics, mediastinal lymph node involvement, thoracic duct interruption, bronchial obstruction, pericardial involvement, etc., Indirect involvement of pleura in malignancy may also results secondary to hypoproteinaemia, postobstructive pneumonitis, pulmonary embolism, postradiotherapy, etc., in these cases.[2]


   Clinical Assessment Top


The initial clinical assessment essentially includes an in-depth clinical history to identify the possible underlying cause for pleural effusion. Symptoms and signs may be specific to the respiratory system or nonspecific one. Dyspnea is a major respiratory symptom in such patients and is usually progressive. This is seen in up to 50% of the patients of MPE and due to several factors that includes loss of functional lung tissue secondary to atelectasis, mediastinal shift and most importantly reduced compliance of chest wall.[3] Chest pain is another important symptom in these patients although it is nonspecific and can occur in inflammatory processes such as infections and other conditions like pulmonary infarction. About 60% of patients having mesothelioma experience constant dull or occasionally localized pleuritic chest pain compared with patients having MPE due to adenocarcinoma.[4] Hemoptysis usually point towards associated endobronchial lesion. A cough is another nonspecific symptom. History is also useful in getting information about asbestos exposure to suggest mesothelioma and other conditions like drug-induced pleural effusion.

Constitutional symptoms such as fever, decreased appetite, weight loss, night sweats, restriction of daily activities, although nonspecific one, are most often seen. A previous history of malignancy at other body sites even in the remote past should be seriously asked in such patients.

Physical examination should be thorough in these patients. The findings of superior vena cava obstruction, soft tissue swellings or lymph nodes are important to suspect malignancy and reach the final diagnosis. In all women, a careful breast and pelvic examination should always be attempted as these may be the sites for primary malignancy. Respiratory system examination findings usually suggest pleural effusion in such cases depending on the amount of pleural effusion. One should not forget to leave the possibility bilateral pleural effusions that can occur in this situation.


   Imaging Studies Top


Chest radiograph

It is almost always abnormal in patients with MPE. A standard chest radiograph can detect as little as 50 ml of pleural fluid on lateral view. A massive or recurrent effusion with shift of mediastinum to contra lateral side usually point toward underlying malignant etiology [Figure 1]a. Chest radiograph may also show some additional features such as lobulated pleural thickening, plaques, atelectasis, consolidation, mass lesion, mediastinal widening, reticulonodular shadows or lymphangitic patterns, etc.[5]
Figure 1: (a) Chest radiograph showing massive pleural effusion with ipsilateral mediastinal shift; (b) computed tomography scan showing mediastinal pleural thickening with focal nodular areas (see arrows); (c) computed tomography guided pleural biopsy of the same patient showing histological features consistent with epitheliod variety of malignant mesothelioma

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Chest ultrasonography

It has 100% sensitivity to diagnose pleural effusion. Even small or loculated effusion can be best detected on ultrasonography. Effusions with loculations and fibrous septa may sometimes give pseudo mass like appearance on chest radiography that may be resolved by chest ultrasound. Chest ultrasound also detects tumor in relation to parietal pleura and chest wall. It is an important tool not only for screening but also in diagnosing MPE by doing guided aspiration, fine needle aspiration cytology, biopsy etc.[6]

Certain ultrasonographic features such as pleural nodularity, pleural thickening more than 10 mm, diaphragmatic thickening more than 7 mm are diagnostic of malignancy with 73% sensitivity and 100% specificity.[7] An echogenic swirling pattern characterized by numerous free floating echogenic particles swirling in the pleural cavity during respiratory movements or heart beat is another sign that points toward MPE.[8] Pleural metastases may appear as circular, nodular or broad based with frond-like extensions in the pleural cavity.[9]

Computed tomography

Computed tomography (CT) of the chest is an important investigation in patients of MPE. It is superior to conventional chest radiograph and ultrasound in detecting pleural thickening and focal masses. Not only pleural space but also the lung parenchyma and mediastinum can be assessed in such cases. The CT features highly suggestive of malignancy are nodular pleural thickening, pleural irregularity, mediastinal pleural thickening, circumferential pleural thickening, and pleural thickness more than 10 mm [10] [Figure 1]b. The reported sensitivity is 36–51% with specificity of 88–100%. However, in a large series of 370 patients the sensitivity was 68%, but the specificity was 78% with a negative predictive value of 65% only stressing the role of invasive pleural biopsies even in patients having negative CT report for malignancy.[11]

Magnetic resonance imaging

Magnetic resonance imaging (MRI) has a limited role in pleural effusion due to poor spatial resolution and motion artifacts. However T1-weighted images after intravenous gadolinium contrast may occasionally help in detecting pleural enhancement.[12] It is effective in detecting tumor invasion into chest wall and diaphragm. MRI with triple-echo sequence has high sensitivity for small effusions and can identify features of fluid to differentiate exudates from transudative effusions.[13]

Fluorodeoxyglucose-positron emission tomography imaging

Chest imaging with positron emission tomography (PET) with fluorine 18-labled fluorodeoxyglucose (FDG) has shown sensitivity of 93–100%, specificity of 67–89% in MPE with negative predictive value of 94–100%. However, false positive results can occur in uremic effusions, parapneumonic effusions, and following pleurodesis.[14] A meta-analysis of 14 studies covering 407 patients with MPE suggest that, although of some value, FDG-PET imaging does not seem to change the probability of pleural malignancy sufficiently enough to be recommended in the routine workup of effusions of undetermined etiology.[15]


   Pleural Thoracocentesis Top


The diagnosis of MPE requires demonstration of malignant cells in pleural fluid for that cytological examination of pleural fluid is required. Thoracocentesis is a must investigation in all exudative pleural effusion cases with strong suspicion of malignancy.

Pleural effusion with hemorrhagic or serohemorrhagic appearance is likely to be malignant. Pleural effusion in malignancy is exudate on biochemical analysis by light's criteria. However in rare instances, a transudative pleural effusion may also show malignant cells on cytological examination.[16] A low pleural fluid pH <7.3 and low sugar <60 mg/dl although common phenomenon in parapneumonic effusion or empyema, may also be seen in MPE and suggest extensive pleural involvement and rapid tumor cells metabolism. A low sugar and low pH malignant effusion have diagnostic, therapeutic, and prognostic implications. The diagnostic yield of pleural fluid cytology is usually high in such cases, and the outcome of therapeutic interventions and survival is also poor in such patients due to extensive pleural involvement.[17]


   Pleural Fluid Cytology Top


Pleural fluid cytology is a simplest and definitive method to diagnose MPE. However, the diagnostic yield of pleural fluid cytology ranges from 40% to 87%.[2] The diagnostic yield of pleural fluid cytology depends on several factors such as extent of disease, nature of primary malignancy, number of specimens taken, transportation time, experience of cytopathologist, use of fixative solutions, use of cell blocks in addition to smear, and the histological type of malignancy (adenocarcinoma is commonly diagnosed compared to squamous cell carcinoma) etc.[18] The distinction between atypical mesotelial cells and metastatic carcinoma may be difficult at times. When adenocarcinoma is diagnosed on cytology, it is difficult to identify the primary site of the tumor. Three factors are important while considering the primary site of metastatic malignancies that include-The type of cells present in the effusion; location of effusion in relation to age and sex; and presence and nature of tumor at the distant site.[19]


   Tumour Markers in Pleural Fluid Top


Several tumor markers such as carcinoembryonic antigen (CEA), carbohydrate antigen-125 (CA), CA-19-9, cytokeratin fragment-21-1, stage-specific embryonic antigen-1

, nonspecific enolase etc., has been tested in patients of MPE.[20] Routine use of tumor markers in the diagnosis of MPE is presently not recommended as some overlap may occur with benign effusions, and further pathological examination is warranted. In patients of effusions of undetermined cause and negative cytology, an increased pleural fluid mesothelin or fibulin-3 level strongly favors mesothelioma.[21]


   Immunohistochemical Tests Top


Use of monoclonal antibody may help to differentiate malignant from benign effusion. Immunocytochemistry also helps in differentiating epithelioid mesothelioma from adenocarcinoma and also to establish the primary site of MPE in patients with an occult primary or multiple primaries. This is an essential investigation for the diagnosis of mesothelioma now days. Metastatic adenocarcinoma reacts positively to CEA, MOC 3.1, B72.3, Ber-EP4, BG-8 and thyroid transcription factor-1 (TTF-1). Malignant mesothelial cells and benign mesothelial cells stains positive to calretinin, keratin 5/6, podoplanin, and WT-1. TTF-1 has high specificity for lung cancer [Figure 2].[22]
Figure 2: The biomarkers in various types of malignant pleural effusion

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Different molecular tests such as fluorescent in situ hybridization and gene expression may complement cytology in diagnosing MPE but requires specialized equipment and personnel, therefore limiting its routine use in clinical practice.[23]

Biochemical/biological markers in malignant pleural fluid or serum cannot replace routine cytopathologic examination in the diagnosis of disease and predicting patient outcome without a firm diagnosis.


   Pleural Biopsy Top


Another method to diagnose MPE is to demonstrate malignant cells in the pleural tissue that can be done by pleural biopsy. The diagnostic yield of needle biopsy of the pleura in patients with MPE ranges from 39% to 75%.[2] The diagnostic yield of pleural biopsy is relatively lower compared to pleural fluid cytology. A combination of pleural fluid cytology and needle biopsy of the pleura seems to improve the diagnostic yield compared to single technique alone. Low diagnostic yield of pleural biopsy may be due to factors such as early stage disease with small pleural extension, location of tumor in those areas of pleura which are not approachable by needle (including diaphragmatic, visceral, and mediastinal pleura), number of blind biopsy specimens (at least 5 biopsy specimens are needed for accurate diagnosis), site of pleural biopsy (higher diagnostic yield when lowest costal pleura is selected) and inexperience of performing physician.[24]

Image-guided pleural biopsy under ultrasound or CT guidance also improves diagnostic yield in cytologically negative pleural effusions compared to blind biopsy by Abram's or Cope's needle [25] [Figure 1]c.


   Thoracoscopy/pleuroscopy Top


Thoracoscopy is considered to be gold standard in the diagnosis of MPE when previous investigation workup has turned negative. This is a simple and safe technique with diagnostic yield ranging from 93% to 97%. Procedure can be performed under local anesthesia by semi rigid or rigid thoracoscope and under general anesthesia for video-assisted thoracic surgery (VATS) with single lung ventilation to sample the pleural lesions under direct vision. Endoscopic features highly suggestive of malignancies are multiple nodule, polypoidal masses, pleural ulcerations, candle wax droplet lesions etc., [Figure 3]. Use of autoflorescence during thoracoscopy may be useful when early pleural malignancy are studied and has potential in diagnostic and staging of malignant mesothelioma. Thoracoscopy has an important role in diagnosis and staging of lung cancer causing MPE. In recent tumor–node–metastasis staging of lung cancer, pleural metastasis/effusion is defined as Stage M1a (from T4) representing/corresponding change from Stage III b to Stage IV. It is rare to find resectable lung cancer in presence of exudative pleural effusion despite having negative cytology. Therefore, thoracoscopy can establish operative eligibility by determining if the pleural effusion is paramalignant or due to metastasis.[26]
Figure 3: Thoracoscopic appearance in (a) metastatic lung cancer as multiple nodules over both visceral and parietal pleural surface; (b) malignant mesothelioma as diffuse goose like pleural thickening with irregular pleural surfaces; (c) metastatic ovarian cancer as multiple small discrete nodules; (d) metastatic sarcoma as multiple large polypoidal nodules

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Thoracoscopy is also favored over thoracotomy in patients of malignant mesothelioma. As the pleural specimens are equally comparable, staging can be performed in a minimally invasive manner and fluorescence detection using 5-aminolevulinic acid can be applied to improve staging.[26]

Complications of thoracoscopy are usually mild and include hemorrhage, hypotension, cardiac arrhythmia, prolonged air leak, subcutaneous emphysema, postoperative fever, empyema, wound infection, and seeding of chest wall, especially in malignant mesothelioma. Mortality in conventional thoracoscopy using rigid instrument ranges from 0.09% to 0.24% that is comparable with conventional bronchoscopic transbronchial lung biopsy.[26]


   Bronchoscopy Top


Bronchoscopy is indicated in patients where endobronchial/endotracheal lesion are suspected and those cases having hemoptysis. This is also preferred in those patients having atelectasis and pulmonary infiltrates on chest X-ray and/or CT scan. Bronchoscopy is helpful in assessing the extent of disease in the tracheobronchial tree for management and prognosis of lung cancer associated effusions. [Figure 4] illustrates the initial diagnostic approach in suspected cases of MPE.[27]
Figure 4: The diagnostic steps in suspected malignant pleural effusion

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   Management Options in Malignant Pleural Effusions Top


MPE still remains a therapeutic challenge to pulmonologist and oncologist. The primary goal of treating MPE is palliative to improve quality of life and reduce symptoms. The various therapeutic options for patients with recurrent MPE are summarized in following [Table 1].
Table 1: Management options in MPE

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Therapeutic options in malignant pleural effusion

The initial step after diagnosis in these patients should be search of primary site of malignancy. Certain primary malignancies i.e., small cell lung cancer, breast carcinoma, ovarian carcinoma, some nonsmall cell lung cancers and lymphoma etc., respond positively to systemic chemotherapy. In these cases definitive intervention beyond this approach may not be necessary for MPE. Many of these cases respond to simple drainage for symptomatic relief pending response to the systemic chemotherapy. However, if there is recurrence of effusion after systemic therapy definitive management should be considered. If the patient is having chylothorax, radiotherapy should be given to mediastinum.[2],[28]

Those patients where primary malignancy is not responsive to chemotherapy or fails to respond to chemotherapy, definitive management approach should be considered for recurrent symptomatic MPE. It is also important to note that only those patients who are dyspneic and whose dyspnea improves after therapeutic thoracocentesis should be considered for pleural fluid removal. If the patient is asymptomatic and effusion is small no treatment is recommended and simple observation is required.[2]

Those patients where dyspnea do not improve after therapeutic thoracocentesis, alternative causes of dyspnea should be ruled out such as microtumor emboli, lymphangitis carcinomatosis, pulmonary thromboembolism, effect of chemo or radiotherapy, cardiac failure, pericardial effusion, restrictive cardiomyopathy due to tumor infiltration, constrictive pericarditis, airway obstruction by tumor, bilateral vocal cord paralysis, concurrent infection, cancer-related cachexia, myopathy, deconditioning, chest wall invasion by tumor, etc.[29] Many of these patients requires supportive and symptomatic treatment that includes oxygen and/or opiates.

All symptomatic patients of MPE having dyspnea relieved by therapeutic thoracocentesis and when effusion is recurrent, moderate to massive even after systemic chemotherapy to primary malignancy should be subjected to definitive management approach that includes thoracostomy drainage followed by pleurodesis or indwelling pleural catheter. Repeated thoracocentesis is another option in those patients where fluid re accumulate rapidly, expected survival is 1–3 months and interventional procedures cannot be tolerated.[30]

Chest tube drainage is primarily used in MPE for symptomatic relief and chemical pleurodesis. Smaller chest tubes (10–14 French size) equally works well as larger chest tubes and are recommended by British Thoracic Society guidelines.[31] After tube thoracostomy if the lung expands, pleurodesis is the procedure of choice. However if the underlying remains collapsed after tube thoracostomy, pleurodesis should not be attempted. These patients require either indwelling pleural catheter or pleuro-peritonial shunts.


   Pleurodesis Top


Pleurodesis is one of the most commonly used management approaches. This is considered in patients with MPE who are not suitable candidates for pleural catheter or systemic chemotherapy and also where systemic chemotherapy or mediastinal radiotherapy has failed. Only symptomatic patients having massive and recurrent collection with mediastinal shift to opposite side responds best to pleurodesis. Successful pleurodesis requires apposition of the visceral and parietal pleura. Patients with underlying trapped lung or endobronchial obstruction are unlikely to respond.[32] Various methods such as physical, chemical, and biological agents have been used for pleurodesis. The commonly used agents are tetracycline or its derivative, quinacrine, iodopovidine, bleomycin, mitoxantrone, cisplatin, doxorubicin, etoposide, fluoro uracil, mitomycin, interferons (IFN) and methyl prednisolone, Corynebacterium parvum, etc., apart from talc with varying success rates. The talc is most commonly used agent with highest efficacy and least cost that can be given as slurry through drainage tube or via insufflation method by thoracoscopy.[2]

Controversies exist as to whether talc slurry is as efficacious as aerosolized talc via thoracoscopy. Although the two techniques are equally effective, thoracoscopic insufflations of talc has been found marginally superior to talc slurry in a recent phase III prospective study on 482 patients of lung cancer.[33] The risk of acute respiratory distress syndrome using talc is directly related to the dose, particle size or other factors related to its instillation. Larger particle size (more than 15 microns) has reduced the risk of this complication now days.[34]

Thoracoscopic pleurodesis can be achieved either through VATS or medical thoracoscopy. The pleurodesis can be achieved by intrapleural sclerosants or pleural abrasion using dry-gauze pea nut. Pleurodesis using medical thoracoscopy under local anesthesia and moderate sedation has been shown to achieve success rate up to 97% with low morbidity.[35]

In a prospective multicenter trial, the second therapeutic intervention in malignant effusion trial 2 recently compared patients undergoing talc pleurodesis using 12 Fr small bore catheter tube with indwelling tunneled pleural catheters. The success rate of 89% was seen by pleurodesis in 54 patients that received talc slurry via chest drains.[36]


   Indwelling Tunneled Pleural Catheter Top


Tunneled pleural catheter system (Pleur X) is a 15.5 Fr catheter that may be placed in outpatient setting under local anesthesia. Drainage is performed daily or alternate day by the patient, family members or visiting healthcare professionals. Spontaneous pleurodesis have been reported in 21–58% patients; however, symptomatic improvement occurs in 81–100% patients.[37] Complications are generally low (5–27%) and includes bleeding, pneumothorax, cellulitis, empyema, catheter obstruction with subsequent tension pleural effusion and tumor spread along the catheter tract, etc.[38] This method is becoming increasingly popular in view of reduced hospitalizations, recovery time and overall cost.[39]

If above procedures fails, pleuro-peritonial shunt, or pleurectomy can be considered. However, these procedures are costly, associated with high morbidity, operative mortality and should be reserved in patients with significant anticipated life expectancy.[40]

Management of malignant pleural mesothelioma is multimodality treatment programs that combine maximal surgical cytoreduction with nowel forms of radiation therapy and more effective chemotherapy combination to offer survival benefits. Lung sparing surgery may allow improvements in pulmonary functions after surgery based multimodality therapy compared to extrapleural pneumonectomy. Experimental treatment such as immunotherapy and gene therapy (suicide gene therapy and cytokine gene therapy) may be future modality of treatment in addition to current standard therapy.[41]

Role of intrapleural chemotherapy for management of MPE is controversial. This has been applied in hope to reduce the tumor cells in pleural space. Its efficacy is doubtful if the tumor is disseminated. Therapeutic efficacy of Staphylococcus aureus superantigen has also been evaluated in MPE from nonsmall cell lung cancer in small case series to control the effusion and improve survival.[42] Other intrapleural agents investigated include Rituximab, IFN-gamma, interleukin-2 etc.[2]

In multiloculated pleural effusions intrapleural fibrinolytic agents i.e. streptokinase has also been used successfully to relieve dyspnea in these terminally ill-patients without any complications.[43]


   Prognosis Top


Life expectancy is usually short in patients of MPE. The rationale approach to treatment is usually palliative involving drainage of pleural effusion and prevention of recurrence. Median survival in these patients ranges from 3 to 12 months depending on the primary site, stage and histological type of underlying malignancy (17.4 months in mesothelioma, 13.2 months in breast cancers, 7 months in lymphoma and 2.6 months in lung cancers).[44]

Poor prognosis factors in these patients also includes the Karnofsky performance scale <30, pH of pleural fluid <7.2, pleural fluid glucose <60 mg/dl, pleural fluid lactate dehydrogenase more than twice the upper limit of normal for serum, pleural adhesions seen on thoracoscopy, higher vascular endothelial growth factor levels in pleural effusions due to lung cancers.[45] All these situations reflects greater tumor burden in the pleural space.


   Conclusion Top


MPE is a common manifestation in patients having advanced lung cancer and other malignancies. There has been a considerable improvement in the diagnosis of MPE through newer cytologic and imaging techniques with improved methods of pleural biopsy. Despite various well tolerated techniques to control MPE by pleurodesis or long-term catheter drainage, all management approaches remain palliative. While selecting an appropriate intervention, clinician should consider patients general condition, cost, expected survival, local expertise, and comparative institutional outcome from the available techniques.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
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    Figures

  [Figure 1], [Figure 2], [Figure 3], [Figure 4]
 
 
    Tables

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  In this article
    Abstract
   Introduction
   Clinical Assessment
   Imaging Studies
    Pleural Thoracoc...
    Pleural Fluid Cy...
    Tumour Markers i...
    Immunohistochemi...
   Pleural Biopsy
    Thoracoscopy/ple...
   Bronchoscopy
    Management Optio...
   Pleurodesis
    Indwelling Tunne...
   Prognosis
   Conclusion
    References
    Article Figures
    Article Tables

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