Amyloidosis is a disease resulting in extra-cellular deposition of insoluble protein that typically possesses an apple-green birefringence with polarized light and positive Congo red staining. Electron microscopic assessment of these proteins in the late 1950s revealed that they were actually fibrils. Once deposited, they can result in organ dysfunction. There are several types of amyloid deposits with the most common being AL (immunoglobulin light chain fragments) and AA (serum amyloid A). The disease is rare, with an incidence ranging from 9 to 14 cases per million person-years (1). The incidence of persistent pleural effusions secondary to systemic amyloidosis or even more rare, as it has only been described in 6% of patients with systemic amyloidosis from a high-volume amyloidosis center (2). Given how uncommon it is, the exact classification and treatment remains elusive. We add to the body of literature of pleural amyloid deposition resulting in persistent pleural effusions, mimicking a malignant mesothelioma.
A 77-year-old female presented with hypoxia and pleuritic chest pain secondary to recurrent bilateral pleural effusions. Her past medical history is significant for B-cell lymphoma, small lymphocytic lymphoma, temporal arteritis, trisomy 12, and intra-abdominal amyloidosis (AL—Kappa type). She was known to our surgical service as she had a video-assisted thoracoscopic (VATS) right partial decortication and wedge biopsy along with a left and right pleur-X catheter placement in the past. On this presentation, her left pleur-X catheter appeared to be clogged. Preoperative chest radiograph revealed a significant effusion on the left (Figure 1). Computed tomography furthered revealed a complex, loculated effusion on the left (Figure 2). A pigtail catheter was placed and we attempted multiple lytic catheter infusions to break up the loculations. This failed and we were concerned that she had developed pulmonary entrapment. She was brought to the operating room for a left VATS decortication that required conversion to an antero-lateral muscle sparing thoracotomy. She underwent a full lung decortication. Intraoperative findings included a dense fibrous peel that possessed a rubber-like texture. Frozen sections were sent which were negative for malignancy. Pleural fluid character was exudative. Tube thoracostomies were placed and removed postoperatively once deemed appropriate. Her intraoperative fluid cultures were negative for bacterial or fungal growth. She was eventually discharged home with pulmonary rehab and supplemental oxygen on postoperative day 6. Hematoxylin and eosin staining demonstrated amorphous material surrounding vessels (Figure 3). Congo Red staining revealed amyloid surrounding vessels (Figure 4) and apply-green birefringence with polarized light (Figure 5) similar to a previous abdominal tissue/omental biopsy. Her outpatient chest radiographs show a significant improvement although there continues to be a small residual effusion at the base with blunting of the diaphragmatic angle (Figure 6).
In an effort to discover the cause of these persistent pleural effusions associated with amyloidosis of the pleura, Berk et al. reviewed their experience of 636 patients with AL type amyloidosis (2). They found 35 (6%) with persistent pleural effusions requiring multiple large volume thoracocentesis and aggressive diuresis. They compared this group to 120 patients with cardiac AL amyloidosis without pleural effusions. They performed extensive tissue biopsies as well as echocardiographic comparisons between groups and failed to find an obvious difference contributing to pleural effusions. They concluded that AL amyloid deposits in the pleural cavity could possibly result in direct disruption of pleural function. To date, no clear mechanism has been described, however experts in the field believe the process is secondary to an underlying lymphoproliferative disorder. Pathological evaluation by Khoor et al. found that pleural involvement correlated to pleural effusions (3). At the histological level, the pulmonary architecture appeared preserved. Khoor et al. notes that under closer inspection, the alveolar septa were thickened with eosinophilic infiltration involving the walls with small nodules from amyloid deposition.
Since 2003, there have been several case reports of persistent pleural effusions found to be secondary to amyloid deposition in the pleural space (4-10). Thus far, the largest series reported is from Berk et al. (2) who published a median survival time of 1.8 months in untreated patients with persistent pleural effusions. With intensive chemotherapy and autologous stem cell transplantation, survival increased to 21.8 months. To our knowledge, the surgical treatment of this disease has not been clarified. We performed a full lung decortication with hope for re-expansion and to promote symphysis between the visceral and parietal pleura. Some groups have performed VATS talc pleurodesis to prevent further effusions (9,10). However, talc is not commonly used in today’s practice.
Although persistent pleural effusions secondary to systemic amyloidosis are rare, it should be on the differential list of pleural disease. At this time, the mechanism of pleural disruption from amyloid deposition is theoretical, as other studies have shown no correlation of pleural amyloid deposits when there is cardiac involvement. Continued investigation of this disease process is warranted as it carries a significantly poor prognosis.
Conflicts of Interest: All authors have completed the ICMJE uniform disclosure form (available at http://dx.doi.org/10.21037/ccts.2019.05.03). The authors have no conflicts of interest to declare.
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Cite this article as: Tran A, Blutreich AM, McKelvey A. Pleural amyloidosis presenting as recurrent bilateral pleural effusions. Curr Chall Thorac Surg 2019;1:5.