==== Front Respir Med Case RepRespir Med Case RepRespiratory Medicine Case Reports2213-0071Elsevier S2213-0071(18)30086-810.1016/j.rmcr.2018.06.009Case ReportCement pulmonary embolism after percutaneous vertebroplasty in a patient with cushing's syndrome: A case report Rahimi Besharat besharatrahimi@yahoo.comaBoroofeh Behdad b.boroofeh@yahoo.comaDinparastisaleh Roshan roshan.dinparast@gmail.comb∗Nazifi Hale h.nazifiii@gmail.comba Pulmonology Department, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iranb Internal Medicine Department, Imam Khomeini Hospital, Urmia University of Medical Sciences, Urmia, Iran∗ Corresponding author. roshan.dinparast@gmail.com27 6 2018 2018 27 6 2018 25 78 85 30 3 2018 16 6 2018 17 6 2018 © 2018 The Authors2018This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).Background Vertebroplasty is a procedure most commonly used for vertebral compression fractures. Although it is a relatively safe procedure, complications have been reported. Cement embolism is seen in 2.1%–26% of patients after percutaneous vertebroplasty. Case presentation a 38-year-old male who was diagnosed with cushing's syndrome, underwent percutaneous vertebroplasty for his thoracic osteoporotic compression fractures. 24-hours following vertebroplasty, he presented to emergency department with acute-onset dyspnea and chest pain. Chest radiography showed an opaque linear lesion in left pulmonary artery which was suggestive of cement embolism. Pulmonary spiral CT-scan further confirmed the diagnosis. The patient's symptoms improved over time, and warfarin was started with close cardiopulmonary assessments for indicators of cement embolus removal. Conclusion in patients with pulmonary cement embolism, conservative treatment may be recommended rather than a surgical removal except when the obstruction is extensive enough to cause hemodynamic changes. Given that all the related studies have suggested that pulmonary thromboembolism can occur as a complication due to bone cement leakage, discovering new cement alternatives and/or injection devices, seems beneficial. Keywords Percutaneous vertebroplastyCement embolismComplicationscushing's syndrome ==== Body 1 Background Vertebroplasty is a minimally invasive procedure most commonly used for vertebral compression fractures which was first introduced by Galibert et al., in 1987 [1]. In this procedure, polymethylmethacrylate (PMMA) is injected directly into the vertebral body through its pedicle, to restore the height partially, stabilize bony trabeculae, and alleviate pain. Due to its minimal invasion and immediate pain relief, percutaneous vertebroplasty gained popularity for the treatment of painful tumor infiltration disease such as multiple myeloma [2], and metastatic carcinoma [[3], [4], [5]], and for patients who have refractory pain due to osteoporotic thoracolumbar compression fractures [[6], [7], [8]] Although it is a relatively safe procedure, complications have been reported [9,10]. Acrylic cement of polymethylmethacrylate injected into the vertebral body can leak into the paravertebral venous system and reach the pulmonary artery via the azygos vein leading to a cement pulmonary embolism [[11], [12], [13], [14], [15]]. Pulmonary embolism of cement is seen in 4.6% of patients after percutaneous vertebroplasty. It can be asymptomatic and is directly related to the frequency of paravertebral venous leak, but not to the number of vertebral bodies treated [16]. Here, we report a case of cement pulmonary embolism following vertebroplasty for thoracic compression fracture. 2 Case report This is a 38-year-old smoker male who is a truck driver. He visited his family physician in July 2017, because of unintentional weight gain and a debilitating back pain. In physical examination he had a buffalo hump and central obesity, thus he was prescribed symptomatic treatment for his back pain and referred to an endocrinologist to evaluate for cushing's syndrome. His laboratory studies in following month showed a significantly high level of 24-h urinary free cortisol which was repeated 3 times and a plasma ACTH of 82pg/ml, which was suggestive of an ACTH-dependent cushing's syndrome. The urinary free cortisol after low and high-dose dexamethasone suppression test reported to be 546 and 764 mcg/24h respectively, which means resistance to dexamethasone and a negative test result. A magnetic resonance image (MRI) of pituitary following gadolinium administration was done which showed no abnormality. Because of the discordance between pituitary MRI, plasma ACTH level, and high-dose dexamethasone suppression test results, inferior petrosal sinus sampling (IPSS) was done by interventional radiologist, which showed a petrosal/peripheral ACTH ratio of less than 2. An ectopic ACTH syndrome was suggested which could not be localized with chest and abdominal CT scan. Ketoconazole was administered to control the cortisol excess, while planning for a bilateral adrenalectomy. The patient was also evaluated for his refractoy back pain. MRI revealed diffuse osteopenic signal changes in lumbar vertebrae and multiple sites of compression fracture in all thoracolumbar vertebral bodies. Bone densitometry showed osteoporosis most severe at spine (mean Z-score and T-score < −2.9). As the patient was symptomatic, the decision has been made to proceed with vertebroplasty. High viscosity cement was injected into T7 to T12 vertebral bodies under fluoroscopic guidance in February 2018. The total volume of injected cement was 4 cc in each level. The patient tolerated the procedure and was discharged uneventfully. 24-hours following his vertebroplasty, he presented to our emergency department with a history of sudden-onset dyspnea and chest pain. Vital signs were within normal limits except tachycardia. He had no hypoxia, fever, chills, cough, and hemoptysis. The ECG was normal, except sinus tachycardia and cardiac troponins were negative. Echocardiography revealed no regional wall motion abnormalities with a 50% ejection fraction, a tricuspid valve regurgitation, and mildly increased systolic pulmonary artery pressure (35 mmHg). Chest radiography showed an opaque linear lesion in the left pulmonary artery (Fig. 1), which raised the suspicion of bone cement pulmonary embolism. Parenteral anticoagulation was started, and patient underwent pulmonary spiral CT-scan which revealed artifact-like hyperdense area in main pulmonary artery and left pulmonary artery suggestive of cement embolism (Fig. 2, Fig. 3). During the hospitalization, patient's symptoms resolved, and warfarin was started. Cardiovascular surgery consultants recommended medical rather than surgical treatment with close cardiopulmonary monitoring for any signs and symptoms suggestive of worsening embolism. The patient was asymptomatic when he was discharged. Serial cardiac and pulmonary assessments will be carried out looking for increased pulmonary artery pressure as an indicator for the removal of the cement embolus.Fig. 1 Chest X-ray showing linear opaque lesion in left pulmonary artery. Fig. 1Fig. 2 Hyperdense lesion on left pulmonary artery. Fig. 2Fig. 3 Hyperdense lesion on main pulmonary artery and left pulmonary artery. Fig. 3 3 Discussion We present a case of 38-year-old man who underwent a T7 to T12 vertebroplasty because of osteoporotic compression fractures, and subsequently had a pulmonary cement embolization to his pulmonary arterial circulation, which was treated non-operatively with anticoagulation. Operative treatment of vertebral compression fractures has included percutaneous vertebroplasty for the past 30 years. Introduced by Galibert et al. [1] in 1987, this procedure gained popularity steadily and is used as an immediate pain relief method, in osteoporotic compression fractures [[6], [7], [8]] and for treatment of tumor infiltration disease such as metastatic carcinoma [[3], [4], [5]], and multiple myeloma [2]. Efficacy of vertebroplasty in alleviating pain, is not without controversy according to Buchbinder et al. [17] and Kallmes et al. [18] studies, which showed no improvement in pain and pain-related disability in osteoporotic spinal fractures. Bone cement leakage is of particular concern. Cement leakage into the spinal canal can lead to canal stenosis and cord compression [19,20], and cement leakage into the intervertebral foramina can cause nerve root compression [21]. Additionally, cement leakage into the perivertebral system and inferior vena cava (IVC) can drift toward the right heart and pulmonary arterial system with catastrophic results such as cardiopulmonary arrest [33,34], acute kidney injury [22], paradoxical embolism through a patent foramen ovale [23], and death [10,24,36]. Arterial embolization to the aorta and anterior spinal artery has also been described [25,26]. The risk of cement pulmonary embolism first reported by Padovani et al. [27] exists with both vertebroplasty and kyphoplasty, but the exact rate is uncertain because the patients are not routinely screened for cement embolism [28]. The incidences of pulmonary cement embolism after vertebroplasty ranges from 2.1% to 26%, with much of this variation resulting from which imaging technique is used and whether the study is prospective or retrospective [16,[29], [30], [31], [32]]. Clinical features of cardiopulmonary side effects of cement leak in percutaneous vertebroplasty and kyphoplasty include precordial chest pain and tightness [[33], [34], [35], [36]], dyspnea [[35], [36], [37], [38]], cyanosis, palpitation [34], acute respiratory distress syndrome (ARDS) [39,40], and cardiac arrest [12], although some patients with pulmonary cement embolism are asymptomatic [[41], [42], [43], [44]]. The symptoms of cement embolism occurs more commonly days to months after, rather than during the procedure [12,24,39,45]. The cement used in vertebroplasty is of such high density compared to lung field that the visualization of cement emboli on CXR is quite striking, but multiple dense opacities with a branching shape which are scattered randomly or diffusely throughout the lungs are more common [16,29,44]. In our patient, CXR showed an opaque linear lesion in the left pulmonary artery without significant scattered lesions in the lungs. Echocardiography is a safe and non-invasive modality to evaluate hemodynamic status and to reveal the probable echogenic material in the cardiac chambers [46,47]. Chest CT scan accurately shows the locations, the lengths, and the number of cement emboli [35]. Abdul-Jalil et al. proposed that PMMA has a prothrombotic property and can cause endothelial injury, which can result in additional thrombosis [48]. The formation of PMMA toxins can cause direct cellular injury by increasing membrane permeability through releasing inflammatory mediators, and superoxide production. Pulmonary cement embolism finally shares similar phathophysiological similarities with pulmonary embolisms [40]. The cornerstone of treatment of pulmonary cement embolism is close cardiopulmonary monitoring and anticoagulation [27,[49], [50], [51], [52], [53]] but there are some reports of cement embolism requiring surgical removal (including cardiopulmonary bypass and arteriotomy) [33,[35], [36], [37], [38], [39],[54], [55], [56]]. Choe et al. proposed that asymptomatic pulmonary cement emboli should not alter medical treatment [16]. In Venman's study, all 11 patients with venous PMMA migration remained asymptomatic during 1-year follow up [31]. Krueger et al. proposed a management algorithm that includes conservative approach for peripheral asymptomatic cases, anticoagulation for the symptomatic peripheral and asymptomatic central emboli, and surgical treatment for symptomatic central embolism only [57]. We selected anticoagulation and close monitoring for our patient regarding the published case reports of cement embolism which is summarized in Table 1. Because of non-degradable and toxic properties of PMMA, attempts have been made to explore alternative materials that are more suitable for vertebroplasty and kyphoplasty [[58], [59], [60]].Table 1 Published case reports of pulmonary/cardiac cement embolism (1999–2017). Table 1Outcome Treatment Clinical manifestation Indication Gender Age (years) Author/Publication date Uneventful recovery Anticoagulant + Supportive oxygen Chest patin Hemoptysis hypoxia Chronic osteoporotic pain F 41 Padovani et al. (1999) [27] Uneventful recovery Anticoagulant Sudden onset dyspnea Osteoporotic fracture Perrin et al. (1999) [61] Uneventful recovery unclear 2 asymptomatic patients and 1 symptomatic patient unclear unclear unclear Amar et al. (2001) [62] Recovered from respiratory and cardiac failure Anticoagulant + Embolectomy Respiratory distress, atrial fibrillation, hypoxia Pathologic fracture (osteogenesis imperfecta) M 55 Tozzi et al. (2002) [39] Uneventful recovery Supportive oxygen + Anticoagulant Mild dyspnea and chest discomfort Compression fracture M 60 Jang et al. (2002) [50] dyspnea and chest discomfort Compression fracture M 57 Asymptomatic Compression fracture F 60 Died CPR for 60 minutes Sudden onset bradycardia, shock,hypercapnia Osteoporotic fracture Chen et al. (2002) [24] Uneventful recovery Anticoagulant + Embolectomy (interventional catheter procedure + open heart operation) Mild dyspnea Large mass on X-ray Compression fracture F 52 Franc¸ois et al. (2003) [38] discharged No treatment No symptom Incidental finding on CXR Multiple compression fractures M 67 Bernhard et al. (2003) [44] Anticoagulation Osteoporotic fracture Torres Machi et al. (2003) [63] Respiratory symptoms improved Ventilation + 6 mg hydrochloride Ephedrine Repiratory and cardiac distress Osteoporotic fracture F 62 Charvet et al. (2004) [64] Died Mask ventilation, positive pressure ventilation, repeated intravenous boluses of noradrenaline and adrenaline Severe chest pain, Restless, tachypnea, tachycardia, hypertension, oxygen desaturation, loss of consciousness, pulseless electrical activity Osteoporotic fracture Stricker et al. (2004) [45] Died tracheal intubation and mechanical ventilation, intravenous anticoagulation, pulmonary embolectomy Arthralgia, myalgia, fever, ARDS Osteoporotic fracture F 68 Yoo et al. (2004) [40] Discharged Anticuagulation Asymptomatic Osteoporotic fracture F 80 Pleser et al. (2004) Discharged Open heart surgery for hemopericardium and cement removal Chest pain, hemopericardium, cardiac perforation Osteoporotic fracture F 68 Kim et al. (2005) [33] Right atriotomy and inferior vena cavotomy Palpable mass on the subareolar of the left chest wall Compression fracture M 72 Seo et al. (2005) [65] Respiratory symptoms improved Anticoagulation Sudden onset dyspnea Osteoporotic fracture F 78 Pott et al. (2005) [66] died ACLS Shock, hypoxia, cardiac arrest Pain F 81 Monticelli et al. (2005) [12] Discharged Anticoagulation Asymptomatic Osteoporotic fracture F 50 Baumann et al. (2006) [67] Discharged Anticoagulation Hypotension Arrhythmia hypocapnia Collapsed vertebra, pain F 63 Freitag et al. (2006) [49] Discharged No treatment asymptomatic Osteoporotic fracture Due to multiple myeloma F 65 MacTaggart et al. (2006) [42] Died Anticoagulant Respiratory distress Bone metastasis F 68 Barragan-Campos et al. (2006) [10] Uneventful recovery Anticoagulant Dyspnea, chest pain Osteoporotic fracture F 45 Abdul-Jalil et al. (2007) [48] Discharged No treatment asymptomatic Osteoporotic fracture F 64 Uneventful recovery No treatment asymptomatic Lumbar hemangioma M 61 Bonardel et al. (2007) [68] Uneventful recovery No treatment Dyspnea Cough Chest pain Osteoporotic fracture F 85 Liliang et al. (2007) [51] Uneventful recovery Anticoagulant Open-heart surgery Atrial thrombectomy Mild dyspnea Osteoporotic fracture F 55 Lim et al. (2007) [37] Uneventful recovery Pericardial collection aspiration Cement removal Right ventricular wall repair Chest pain Dyspnea Pericardial effusion Cardiac perforation Compression fracture F 59 Lim et al. (2008) [35] Uneventful recovery Cement removal Right ventricular wall repair Tricuspid annuloplasty Chest pain Chest tightness Hemopericardium Severe TR Cardiac tamponade Compression fracture F 65 Son et al. (2008) [56] Discharged Right cardiac catheterization Failed cement removal Asymptomatic Osteoporotic fracture F 68 Cadeddu et al. (2009) [47] Uneventful recovery Endovascular cement removal Chest pain palpitation Bone metastasis (pain) F 51 Braiteh et al. (2009) [34] Uneventful recovery Anticoagulant Surgical cement removal Pericardial drainage Progressive dyspnea Tamponade Osteoporotic fracture F 64 Caynak et al. (2009) [36] Uneventful recovery Anticoagulant Asymptomatic Severe scoliosis and pain M 76 Akinola et al. (2010) [69] Discharged Conservative management Dyspnea Cough Osteoporotic fracture pain F 79 Radcliff et al. (2010) [70] Reported asymptomatic and clinically silent patients with PCE in 26% of patients treated with PVP Venmans et al. (2010) [31] Reported 23 cases of PCE after PVP in 244 patients whom 1 patient was symptomatic from PCE Luetmer et al. (2011) [41] discharged Anticoagulant oxygen Hypoxia Osteoporotic fracture F 78 Abd El-Rahman et al. (2012) [71] Died Percutaneous retrieval of large cement fragment Mechanical ventilation Multiple pulmonary embolies seen in fluoroscopy ARDS Pneumonia Fracture due to bone metastasis M 74 Alcibar et al. (2012) [72] Uneventful recovery Anticoagulant Pleuritic chest pain Dyspnea Generalized weakness Compression fracture due to bone metastasis F 37 Chick et al. (2012) [73] Uneventful recovery Lidocaine Amiodarone Magnesium sulfate Surgical cement removal Non-sustained ventricular tachycardia Right ventricular failure Foreign body in right ventricle Fracture due to bone metastasis F 65 Cohen et al. (2012) [74] Uneventful recovery IVC filter Thrombectomy Urokinase Anticoagulant Balloon angioplasty Leg swelling Thrombosis extending from IVC to right common iliac vein Subsegmental pulmonary embolism Osteoporotic fracture M 69 Kim et al. (2012) [75] Uneventful recovery Anticoagulant Chest pain Tachypnea tachycardia Osteoporotic fracture F 63 Liu et al. (2012) [76] Discharged No treatment Asymptomatic Osteoporotic fracture F 83 Matouk et al. (2012) [77] Not clear Not clear Asymptomatic Osteoporotic fracture F 50 Mishriki et al. (2012) [78] Uneventful recovery No treatment Dyspnea Osteoporotic fracture F 82 Bopparaju et al. (2013) [79] Died Anticoagulant Failure of complete cement removal Sudden dyspnea Tricuspid regurgitation Fracture due to multiple myeloma F 62 Chou et al. (2013) [80] Not clear Not clear Asymptomatic compression fracture M 69 Garcia-Fontan et al. (2013) [81] Uneventful recovery Anticoagulant Antibiotic Short-term corticosteroids Asymptomatic Osteoporotic fracture M 70 Geraci et al. (2013) [82] Discharged Open-heart surgery Cement removal Dyspnea Chest pain Right Ventricle perforation Fracture due to multiple myeloma F 58 Gosev et al. (2013) [83] discharged No treatment Dizziness Generalized weakness Compression fracture M 58 Lee et al. (2013) [84] Uneventful recovery Cardiopulmonary bypass surgery Cement removal from left lower lobe artery Dyspnea Chest pain Osteoporotic fracture F 68 Llanos et al. (2013) [85] Uneventful recovery Surgical removal Pericardial effusion Fever leukocytosis Chest pain Osteoporotic fracture F 86 Moon et al. (2013) [86] discharged No treatment asymptomatic Osteoporotic fracture pain M 74 Sifuentes et al. (2013) [87] Not clear Anticoagulant Dry cough Osteoporotic fracture F 76 Yu et al. (2013) [88] Uneventful recovery Surgical removal of cement Hypotension ARDS Traumatic compression fracture F 71 Arnaiz-Garcia et al. (2014) [89] Uneventful recovery Antiviral No treatment for PCE Acute respiratory failure CMV pneumonia Fracture due to bone metastasis M 49 Chebib et al. (2014) [90] discharged No treatment asymptomatic fracture due to bone metastasis F 39 Chen et al. (2014) [91] Transferred to other hospital Anticoagulant Inotrops Intermittent dyspnea hypotension Osteoporotic fracture F 56 Huh et al. (2014) [92] discharged Open-heart surgery Progressive dyspnea hemothorax Chronic back pain F 68 Kim et al. (2014) [93] Uneventful recovery No treatment Syncope Fracture due to multiple myeloma F 52 Pannirselvam et al. (2014) [94] Discharged Cardiopulmonary bypass Embolectomy Pulmonary wedge resection Chest pain Traumatic fracture Pain M 29 Rothermich et al. (2014) [95] Discharged No treatment Dull chest pain Pathologic compression fracture M 60 Stevens et al. (2014) [96] Uneventful recovery Antibiotic Anticoagulant Dyspnea Compression fracture due to exogenous cushing M 48 Toru et al. (2014) [97] Uneventful recovery Percutaneous retrieval of cement Asymptomatic Osteoporotic fracture F 55 Zhao et al. (2014) [98] Discharged No treatment Asymptomatic Painful fracture M 72 Guirguis et al. (2015) [99] Discharged No treatment Dyspnea responding to nitroglycerine Compression fracture pain F 70 Nooh et al. (2015) [100] Discharged Antiplatelet Dyspnea Chest pain Not clear F 69 Polli et al. (2015) [101] Discharged Open-heart surgery Cement removal Right ventricular repair Sudden onset chest pain Chronic back pain M 65 Schuerer et al. (2015) [102] Uneventful recovery Cardiopulmonary bypass Right atriotomy F 63 Shen et al. (2015) [103] Discharged Anticoagulant Dyspnea Traumatic fracture M 70 Shroff et al. (2015) [104] Not clear Not clear Palpitation Chest pain Dyspnea Osteoporotic fracture F 54 Awwad et al. (2016) [105] Discharged Anticoagulant Asymptomatic Fracture due to bone metastasis F 51 Chai et al. (2016) [106] Uneventful recovery Open-heart surgery Dyspnea Hemopericardium Osteoporotic fracture M 28 Diab et al. (2016) [107] Discharge Open-heart surgery Dyspnea Traumatic fracture M 64 Focardi et al. (2016) [108] Discharge No treatment Asymptomatic Osteoporotic fracture F 58 Gabe et al. (2016) [109] Discharge No treatment Asymptomatic Fracture due to multiple myeloma F 58 Gorospe et al. (2016) [110] Discharge No treatment Asymptomatic Not clear M 32 Memarpour et al. (2016) [111] Uneventful recovery Endoscopic Robot-assisted open heart surgery Chest pain Tachycardia Hypotension Pericarditis Atrial fibrillation Osteoporotic fracture pain F 72 Molloy et al. (2016) [112] Uneventful recovery Open-heart surgery Chest pain Right ventricular penetration Compression fracture M 49 Park et al. (2016) [113] Not clear Not clear Dyspnea Osteoporotic fracture F 77 Botia Gonzalez et al. (2017) [114] discharged Anticoagulant Asymptomatic Traumatic compression fracture M 59 Chang et al. (2017) [115] Not clear Not clear Palpitation Traumatic compression fracture M 65 Cianciulli et al. (2017) [116] Uneventful recovery Anticoagulant Chest pain Pleural effusion Osteoporotic fracture F 57 Hatzantonis et al. (2017) [117] Uneventful recovery Steroids Anticoagulant Fever Respiratory distress hemoptysis Bone neuro-ectodermal tumor F 15 Ramanathan et al. (2017) [15] Uneventful recovery Anticoagulant Hypoxemia Fracture of femur F 96 Talec et al. (2017) [118] Uneventful recovery Anticoagulant Surgical removal Dyspnea Chest pain Not clear M 57 Wu et al. (2017) [13] M = male, F = female, PCE = pulmonary cement embolism, ARDS = acute respiratory distress syndrome, PVP = percutaneous vertebroplasty. 4 Conclusion In patients with pulmonary cement embolism, conservative treatment may be recommended rather than a surgical removal except when the obstruction is extensive enough to cause hemodynamic changes. Given that all the related studies have suggested that pulmonary thromboembolism can occur as a complication due to bone cement leakage, discovering new cement alternatives and/or injection devices, seems beneficial. Funding None. Availability of data and materials All data and materials described in the manuscript will be freely available to any scientist wishing to use them for non-commercial purposes. Authors' contribution Authors contributed equally to this paper. Competing interests The authors declare that they have no competing interests. Consent for publication Written informed consent was obtained from the patient for publication of this case report. A copy of the written consent is available for review by the Editor of this journal. Ethics approval and consent to participate Not applicable. Appendix A Supplementary data The following is the supplementary data related to this article:Multimedia component 1 Multimedia component 1 Aknowledgements None. 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