Kaposi Sarcoma With Bilateral Chylothorax Responsive to Octreotide

Humzah Iqbal, MD

Department of Internal Medicine, University of California San Francisco, Fresno, CA, USA

Abstract

Kaposi sarcoma (KS) is a soft tissue malignancy of the endothelial cells that can rarely invade the thoracic duct and cause bilateral chylothorax. Treatment for chylothorax includes drainage and dietary modification. However, octreotide has been reported to improve chylothorax in some pediatric and post-operative cases. We present a case in which a 9-day course of octreotide led to an improvement of non-traumatic malignant chylothorax.

Abbreviation list

• AIDS: acquired immunodeficiency syndrome
• CT: computed tomography
• HIV: human immunodeficiency virus
• KS: Kaposi sarcoma

Introduction

Kaposi sarcoma (KS) is a malignant, multifocal, highly vascularized tumor of the endothelial cells that most commonly affects the skin but may also include the lymph nodes, mucosa, and viscera (1). KS is commonly associated with human immunodeficiency virus (HIV) and can occur at any CD4 count (2). In very rare cases, Kaposi sarcoma can invade the thoracic duct and cause chylothorax (3). Chylothorax occurs when lymphatic fluid accumulates in the pleural cavity and is usually seen after damage to the thoracic duct following trauma or cardiothoracic surgery. It can also be caused by malignancy, however, bilateral chylothorax secondary to KS is rare. Treatment of chylothorax usually involves drainage of the effusion and initiation of a low-fat diet. Octreotide has been reported to improve traumatic chylothorax, but has only been reported in non-traumatic etiologies in a handful of cases (4). Here, we present a case of bilateral chylothorax associated with KS, which was successfully treated with octreotide.

Case Presentation 

A 40-year-old man with a previous diagnosis of acquired immunodeficiency syndrome (AIDS) and KS presented to the emergency department due to progressive tachypnea, dyspnea, bilateral lower extremity edema, and expansion of his KS lesions onto his legs and genital region. His vital signs were significant for a respiratory rate of 25 breaths per minute and pulse of 109 beats per minute. The patient denied recent infection, trauma, or procedures. Chest X-ray showed a large left pleural effusion with midline shift and a small right pleural effusion (Figure 1).

Figure 1. Upright chest X-ray demonstrating large left pleural effusion with midline shift and small right pleural effusion.

Computed tomography (CT) scan of the chest showed large bilateral pleural effusions with collapse of the right lower lobe and partial collapse of the upper lobes bilaterally (Figure 2).

Figure 2. Representative view from computed tomography (CT) scan (axial plane) in lung windows showing bilateral pleural effusions.

The patient developed hypoxemia and underwent thoracentesis with a total of 1.5 liters of pink, milky fluid removed (Figure 3).

Figure 3. Image of pleural fluid obtained from thoracentesis demonstrating pink, milky appearance.

Bilateral PleurX catheters (PleurX; Iskus Health; London, United Kingdom) were placed for persistent drainage. Fluid studies showed a triglyceride count of 147 mg/dL on the right side and 153 mg/dL on the left side. The patient continued to self-drain when symptomatic and drained about 600 mL of light-colored opaque fluid from each side daily. Serum albumin levels decreased to about 2.0 g/dL over the next week with concurrent development of diffuse pitting edema in all four extremities and abdomen. He was started on a high-protein, low-fat diet consuming up to 6-7 nutritional protein supplements per day with little to no improvement in his clinical state or serum protein levels. Given the patient’s poor response to treatment and persistence of his pleural effusions, a trial of octreotide was initiated. The patient was given octreotide 100 mg three times per day. About 3 days after initiating therapy, the patient refrained from draining his PleurX catheters for the first time and the frequency of draining decreased over the remainder of the week due to improvement in symptoms. The fluid was noted to be less opaque and clearer with each drainage. The patient’s tachypnea and oxygen saturation also showed improvement. After day 9 of octreotide, the treatment was discontinued and repeat pleural fluid studies showed a triglyceride count of 69 mg/dL on the right side and 89 mg/dL on the left side. With the resolution of his chylothorax and improvement in oxygenation status as well as his edema, the patient was discharged and will follow up with Oncology for continuation of his KS treatment.

Discussion

KS is known as an AIDS-defining illness that can invade a variety of tissues in the body leading to manifestations beyond the classic skin lesions. It can cause unusual neurologic, cardiac, orbital, laryngeal, endocrine, and gastrointestinal complications in rare cases (5). We present a case of bilateral chylothorax as another rare potential complication of KS. Other reported cases have presented similarly to our patient, such as a case presented by Pennington et al. (6) which also described dyspnea and hypoxemia with transient but significant improvements in ventilation with serial chest drainage as well as repeated reaccumulation of the chylothorax. In their case, however, the patient died as a result of his condition. Other cases of presumed KS-induced chylothorax have also resulted in marked nutritional deficiencies as seen in our patient (7).

Treatment of chylothorax involves therapeutic thoracentesis, a low-fat diet that is high in medium-chain triglycerides which do not pass through the thoracic duct, and surgical correction or embolization of the defect (8). Though not a standard practice, the use of octreotide has been reported to improve chylothorax in some cases. The majority of these cases have been traumatic chylothorax following cardiothoracic surgery in adults or the pediatric population, or neonates with congenital chylothorax (8). There is a paucity of literature regarding octreotide in the management of malignant and other non-traumatic causes of chylothorax in the adult population. One case has been reported by Togashi et al. (9) which describes chylothorax secondary to idiopathic fibrosing mediastinitis that was treated successfully with octreotide. The exact mechanism is unknown, but as a somatostatin analogue, it may involve a decrease in splanchnic blood flow and subsequent reduction in lymphatic flow from the gastrointestinal system and through the thoracic duct (10-11). There is no standard protocol for the administration of octreotide, however, most studies report a 1-2 week course with recognizable improvements after 2-3 days of treatment, as seen in our patient (12).

Conclusion

Bilateral chylothorax is a rare manifestation of KS that can lead to respiratory failure, malnutrition, and death. We present a case of non-traumatic, malignant chylothorax that was treated successfully with octreotide, a somatostatin analogue. Further studies are necessary to elucidate the exact mechanism of its effect on chylothorax and to establish a standardized treatment protocol for the usage of octreotide in this condition. 

References

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Cite as: Iqbal H. Kaposi Sarcoma With Bilateral Chylothorax Responsive to Octreotide. Southwest J Pulm Crit Care Sleep. 2022;25(5):69-72. doi: https://doi.org/10.13175/swjpccs048-22 PDF

Infected Chylothorax: A Case Report and Review

Louis Eubank¹, Luke Gabe¹, Monica Kraft¹, and Dean Billheimer²

¹Departments of Medicine and Biostatistics, College of Medicine

²Department of Biostatistics, College of Public Health

University of Arizona Health Sciences Center

Tucson, AZ USA

Abstract

Infected chylothorax is a rare complication of a rare pathology with limited literature entirely consisting of case reports, meeting abstracts, and letters to the editor. The case of a 56-year-old male with a spontaneous infected chylothorax successfully treated and discharged to home without any residual effects is described. A systematic review of the literature revealed 11 prior cases of infected chylothoraces. Their etiologies (when known), initial pleural fluid values, and treatment are described. These cases show that while infected chylothorax has a varied presentation and affects a broad range of patients, conservative management including antibiotics, pleural fluid drainage, and symptomatic relief is a safe and appropriate starting point.

Introduction

Chylothorax, a pleural effusion caused by chyle accumulation from obstruction or disruption of the thoracic duct (please see SWJPCC’s Image of the week: chylothorax for an image of non-infected chyle fluid), is a rare condition that may arise from a diversity of etiologies broadly categorized as traumatic or non-traumatic/spontaneous (1). Traumatic causes commonly include iatrogenic injury and chest trauma, although insults as minor as sneezing, light exercise and emesis have been reported (1-3). Non-traumatic chylothorax has been linked to several immunologic and infectious etiologies (1). Regardless of the underlying mechanism, chyle has classically been considered inherently bacteriostatic (1). We present a case of spontaneous infected chylothorax and the first review of infected chylothoraces reported in the literature.

Case Report

A 56-year-old man with alcoholic cirrhosis and remote right-sided hepatic hydrothorax presented to the emergency department complaining of shortness of breath. Patient reported slowly worsening dyspnea over the last six weeks without any other symptoms that had acutely worsened on morning of presentation

Initial vital signs were temperature 38.0°C, heart rate 115, blood pressure 81/60mmHg, and respiratory rate 30 breaths/min on 4L O₂ by nasal cannula; labs significant for white blood cell count of 3100/mm³ and lactate 5.0 mmol/L (normal <2.0 mmol/L).  Physical exam demonstrated a fatigued patient with accessory muscle use on inspiration and absent breath sounds at the left lung base. Computed tomography (CT) study of the chest showed a large free-flowing left-sided pleural effusion (Figure 1A&B) as well as subacute rib fractures (Image 1C).

Figure 1. Thoracic CT on the day of presentation. Panel A: Axial view showing pleural effusion. Panel B: Sagittal view showing pleural effusion. Panel C: Coronal view showing rib fractures (white arrows).

Chart review demonstrated an emergency department visit five months previously for a fall with acute left-sided rib fractures and minimal left-sided pleural effusion.

Thoracentesis removed two liters free-flowing, brown, milky, purulent fluid; analysis significant for 58,880 total nucleated cells (32,800 RBCs), 94% neutrophils, glucose <5, LDH 573 IU/dL (serum 193 IU/dL), triglycerides 191 mg/dL, albumin 1.8 g/dL (serum albumin 2.6 g/dL, laboratory lower limit of normal 3.4 g/dL).

The patient remained hypotensive despite fluid boluses, tachypneic with increasing oxygen requirements, and a repeat lactate was 6.4 mmol/L. Norepinephrine and broad-spectrum antibiotics were started and patient was admitted to the intensive care unit.

Pleural fluid and blood cultures grew Escherichia coli resistant to fluoroquinolones. Chest x-ray showed persistent pleural effusion; a chest tube was placed which drained an additional 1.6 L over the following 24 hrs. The patient subsequently improved: serum lactate normalized within 24 hours, vasopressors were weaned within 36 hours, and supplemental oxygen was discontinued within 72 hours.

Chest tube output decreased to less than 200 ml/day within 48 hours of placement; however, repeat thoracic CT demonstrated a persistent multi-loculated left pleural effusion. Surgical evacuation and pleurodesis were considered given the lack of literature regarding intrapleural lytic therapy in infected chylothorax (a single case report described use of streptokinase in a persistent non-infected chylothorax, 1).  However, the patient’s operative risk was considered prohibitively high. He was managed conservatively with a fat-free diet to reduce chyle leak.

Eleven days after initial presentation fluid studies were significant for triglyceride 45mg/dL with negative cultures. Given that a pleural fluid triglyceride level <50mg/dL yields a less than 5% likelihood of being chylous and the clinical stability of the patient, the chylothorax was felt to be resolved (1). The patient was discharged to home twelve days after initial presentation.

The etiology of patient’s infected chylothorax was never fully elucidated. The most likely explanation is the trauma causing rib fractures also caused a traumatic chylothorax that later became infected. The thoracic duct lies alongside the vertebrae until it drains into the left brachiocephalic vein (Figure 2).

Figure 2. Thoracic duct anatomy (black arrows).

A blow to the posterior left thorax sufficient to fracture multiple ribs is more than sufficient to damage the nearby thoracic duct (1-4).  Arguing against this is most patients with large traumatic chylothoraces present within 10 days of injury (1,2).

Another explanation is the patient developed bacterial empyema secondary to hepatic hydrothorax (ascites that has passed through diaphragm from the peritoneal cavity) followed by non-traumatic chylothorax. These empyemas can demonstrate an indolent course and Escherichia coli is one of the most common causative pathogens isolated (1). Arguing against this is the patient’s previous hepatic hydrothorax was right-sided.

Finally, the chylothorax may have arisen from one of the many known causative medical pathologies (2). Chylous ascites secondary to cirrhosis that migrates into the pleural space via diaphragmatic leaks defects is a known phenomenon, albeit extremely rare (2).

In follow-up two months after discharge the patient had total resolution of respiratory symptoms and no recurrence of the effusion.

Systematic Review

Methods

A MEDLINE search (PubMed) from January 1975 to January 2018 and a Google Scholar search (all years) was conducted to identify eligible studies using the following terms: “Infected Chylothorax” (all fields) OR “Infection AND Chylothorax” (all fields) OR “Chylothorax AND Empyema” (all fields) OR “Chylous Empyema” (all fields). The inclusion criteria for studies were patients with infected non-traumatic chylothorax. A triglyceride level > 110 mg/dL or the presence of chylomicrons in pleural fluid was used to confirm the diagnosis of chylothorax; pleural fluid culture speciation was used to confirm the infection. The exclusion criteria were a lack of laboratory data and duplicate data. Two reviewers (LE, LG) independently reviewed the titles, abstracts, and, when necessary, the full text regarding the inclusion/exclusion criteria. Data extraction was performed independently by two reviewers (LE, LG) using data extraction forms defined beforehand. Discrepancies were resolved by consensus discussion with a third reviewer (MK).

Results

Eight case reports, two published abstracts, and one letter to the editor met the inclusion criteria; all eleven were included in the analysis (Figure 3, 13-23). 

Figure 3. Flow diagram of the literature review.

The general characteristics, demographics, and etiology of infected chylothorax are summarized in Table 1, the initial pleural fluid values are reported in Table 2.

Table 1. Population data.

Table 2. Initial pleural fluid values.

There were 11 patients total: six males and five females; age range 5 days-78 years, mean age 40.5 years (standard deviation 28.5 years). One patient was pharmacologically immunosuppressed while others had chronic diseases known to reduce immune system function including diabetes, excessive alcohol intake, and obesity (24-26). Four (36%) were iatrogenic. Three patients (27%) were infected with Streptococcus viridans and five (45%) were infected with Streptococcus genus. In those with available data, three of ten patients (30%) required intravenous vasopressors. No patients required ventilator management for their chylothorax (two patients were already intubated, one for acute respiratory distress syndrome, the other for unstable hemodynamics secondary to large subarachnoid hemorrhage). Two patients (18%) were managed surgically – one was specifically noted to have failed conservative management (17). Of the known outcomes, eight of nine (89%) survived to discharge and all eight remained asymptomatic at follow-up. The mean follow-up duration was 13.3 months (range 6-24 months).

Discussion

Given the paucity of published experience regarding infected chylothoraces, we believe a descriptive summary is warranted. First, there is a large variation in patient characteristics, including age range, immune competence, comorbid medical conditions, and infectious organism (eight different bacterial species and one parasite).

Second, many of the reviewed cases had a more benign presentation than might be anticipated in the context of a large, infected intrathoracic fluid collection.  Seven of the patients (73%) were hemodynamically stable on presentation and the majority of these patients had very mild chief complaints.

Third, the available data suggest a surprisingly good prognosis considering a previously estimated morality of 10-25% in non-infected chylothoraces, depending on etiology (27). The one patient who did not survive to discharge died due to brain herniation. Those with documented outpatient follow-up were asymptomatic up to 16 months post-discharge. 

Fourth, conservative management was frequently efficacious. Eight patients (73%) were medically managed without complication and did not require extensive antibiotic duration, intrapleural lytic therapy, or surgical intervention. The decision to pursue surgical intervention is not well defined given the very limited number of cases requiring surgical management. A brief discussion of non-infected chylothoraces and their management is therefore warranted.

Non-infected chylothorax is universally described as a rare event, although its exact incidence has not been described. Chylous ascites, which sometimes shares pathogenesis with chylothorax and is one of the causes of spontaneous chylothorax, has an occurrence of one in 20,000 hospital admissions (12). Trauma accounts for approximately 50% of chylothoraces, with esophagectomy being the most common iatrogenic cause (28). Thirty percent are due to malignancy; lymphoma accounts for 70-75% of malignant cases (11). While there are no consensus guidelines on how to treat chylothoraces, many authors agree that first line treatment is conservative management with thoracentesis or chest tube drainage, fat free or medium chain triglyceride diet, and consideration of somatostatin or octreotide (1,5,11,27-29). Although somatostatin or octreotide are used at many institutions, data regarding indications & efficacy of these medications are limited and/or inconsistent – some institutions use these medications at the beginning of treatment, others only if/when initial management has failed (5,27).

Additional treatments may depend on the etiology of the chylothorax: it is suggested that earlier surgical intervention in iatrogenic traumatic chylothoraces, especially post-esophagectomy, may be beneficial (30). Conservative management is likely to fail and surgical intervention is recommended in the following situations: 1) daily drainage greater than 1000 mL chyle (adults) or greater than 100mL chyle/kg body weight (children); 2) chyle leak that persists for more than 14 days; 3) unchanged chest tube output for 7-14 days; 4) clinical deterioration (27,28).

Conservative management for infected chylothoraces appears efficacious in our small sample size with the obvious modification of treating the infection. Most antibiotics adequately penetrate the pleural space, although aminoglycosides should be avoided as they appear to be inactivated by the low pH and relative anaerobic conditions (31).

Limitations

The limitation of this systematic review was the inclusion of only case reports, abstracts, and letters to the editor and the small sample size. Unfortunately, given the rarity of infected chylothoraces, studies with sufficient sample size are unlikely to be available.

Conclusion

Infected chylothorax is a rare complication of an already rare pathology. Our case report and literature review show that it can affect any age group, can be caused by several different organisms, and has a variable presentation. Our data suggests that an initial conservative management strategy in infected chylothoraces can be a safe and effective option.

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Cite as: Eubank L, Gabe L, Kraft M, Billheimer D. Infected chylothorax: a case report and review. Southwest J Pulm Crit Care. 2018;17(2):76-84. doi: https://doi.org/10.13175/swjpcc097-18 PDF