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Erdheim-Chester Disease: a Comprehensive Review

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Erdheim-Chester Disease: a Comprehensive Review ANTICANCER RESEARCH 34: 3257-3262 (2014) Review Erdheim-Chester Disease: A Comprehensive Review AHMED MAHER ABDELFATTAH2, KARIM ARNAOUT1 and IMAD A. TABBARA1 1Division of Hematology and Oncology, Department of Medicine, George Washington University Medical Center, Washington, DC, U.S.A.; 2Faculty of Medicine, University of Alexandria, Alexandria, Egypt Abstract. Erdheim-Chester disease is a rare form of non- identified, none are pathognomonic or diagnostic of ECD. Langerhans' cell histiocytosis characterized by multi-system Stoppacciaro et al. demonstrated that a cytokine and infiltration by xanthogranulomas composed of foamy chemokine network similar to that described in Langerhans' histiocytes surrounded by fibrosis. Approximately 400 cases cell histiocytosis exists in ECD lesions (2). Secretion of have been reported in the literature, and the recent increase interleukin (IL)-6 and cysteine x cysteine (CXC) chemokine in the number of cases is likely due to the increased ligand 8/IL-8 (CXCL8/IL8) plays a major role in recruitment awareness of its associated morbidity and mortality. The and activation of histiocytes and inflammatory cells (3). This etiology of this disease remains unknown, the clinical course process is regulated by tumor necrosis factor, which is also is variable and treatment is still not well-established. The expressed in ECD lesions and which activates other objective of this review is to describe the pathogenesis, downstream inflammatory factors, further worsening tissue clinical manifestations, and diagnosis of this rare disorder, damage. In addition, chemokines expressed by ECD and to review its prognosis and treatment. Erdheim-Chester histiocytes are thought to attract inflammatory cells including disease (ECD) is a rare form of non-Langerhans’ cell T helper-1 (Th1)-type T-lymphocytes expressing chemokine histiocytosis. It was first described in 1930. Approximately receptors, which, in turn, drive activation and chemokine 400 cases have been reported in the literature. production by histiocytes (2, 4). Erdheim-Chester disease (ECD) is a rare form of non- Clinical Presentation Langerhans’ cell histiocytosis characterized by multisystem infiltration by Cluster of Differentiation 68 (CD68) positive Patients with ECD have a variable clinical course, ranging foamy histiocytes surrounded by fibrosis (1). It was first from asymptomatic to fatal, depending on the extent and described in 1930. Fewer than 500 cases have been reported distribution of the disease (Table I). Bone pain represents the in the literature. most common symptom and usually involves the lower limbs. Typical radiological findings, including symmetric Etiology and Pathogenesis diaphyseal osteosclerosis, or symmetric uptake seen in the long bones of the extremities using bone scintigraphy, are The etiology and pathogenesis of ECD are poorly-understood. almost pathognomonic of the disease. Bone involvement is The clonal nature of this disease is still controversial. the first manifestation of ECD in half of all patients. It also Although occasional clonal cytogenetic aberrations have been becomes symptomatic in about 50% of patients over the course of the disease (5). The second most common involved organ is the cardiovascular system which is affected in 77% of the cases. Correspondence to: Imad A. Tabbara, MD, Professor of Medicine, Periarterial infiltration usually has little clinical significance Director Blood & Marrow Transplant Program, Division of except in the case of renovascular infiltration, which may Hematology and Oncology, Department of Medicine, George cause systemic hypertension, usually corrected by renal artery Washington University Medical Center, 2150 Pennsylvania Avenue, stenting (6). Pericardial infiltration causing tamponade, NW, Washington, DC 20037, U.S.A. Tel: +1 2027412478, Fax: +1 2027412487, e-mail: [email protected] predominantly right sided myocardial infiltration, valvular involvement occasionally requiring valve replacement and Key Words: Erdheim-Chester disease, Langerhans’ cell histiocytosis, peri-coronary artery infiltration that may cause potentially review. fatal myocardial infarction have been reported (6-12). 0250-7005/2014 $2.00+.40 3257 ANTICANCER RESEARCH 34: 3257-3262 (2014) Table I. Organ involvement in Erdheim-Chester disease (ECD) Table II. Differential diagnosis of Erdheim-Chester disease (ECD) and Langerhans’ cell histiocytosis (LCH). Organ involved Frequency Marker ECD LCH Skeletal 96% Cardiovascular 77% S-100 protein − + CNS 51% Group 1 CD1a glycoproteins − + Orbital 27% CD68 + − Urologic 11% Birbeck granules − + Pulmonary 43-53% Endocrine Rare Retroperitoneal 29-59% insufficiency that may require hemodialysis (25-27). Retroperitoneal involvement leading to peri-renal or ureteral obstruction and causing renal impairment has been reported Brain involvement occurs in 51% of the cases and is in 29-59% of patients with ECD (20, 28, 29). thought to be the only major predictor of worse prognosis in patients with ECD (13). In a comprehensive neurological Diagnosis series of patients with ECD, Lachenal et al. reported that cerebellar (41%) and pyramidal (45%) manifestations were The diagnosis of ECD is often challenging because of the the the most frequent (14). Other neurological symptoms rarity of the disease and its multi-organ involvement. Tissue include seizures, headache, psychiatric manifestations and biopsy, preferably of an osteosclerotic bone lesion if paroxysmal dystonia. Recently published case reports possible, is crucial for diagnosis. Histopathological mention that ECD might present as an intramedullary spinal examination usually shows foamy S-100-negative and cluster cord lesion (14-18). of differentiation 68 (CD68)-positive histiocytes as the Pulmonary involvement is also common. Arnaud et al. principal cells, surrounded by fibrosis and inflammatory reported that 53% of patients have some degree of lung cells, such as lymphocytes, plasma cells, and Touton-type parenchymal infiltration and 41% have pleural infiltration giant cells (30). CD68-positive and CD1a-negative (19). In another cohort of 53 patients, Arnaud et al. showed immunohistological staining helps to differentiate it from similar results, with 43% of their cases having lung Langerhans' histiocytosis (20, 24) (Table II). A combination infiltration (13). However, both studies concluded that of clinical assessment, pathological examination and pulmonary involvement was not a predictor of worse immunohistochemical staining is used to differentiate ECD prognosis for ECD, contrary to what has been reported in from the other rare types of non-Langerhans’ histiocytosis as earlier studies. shown in Table III (31). Orbital involvement, which is often bilateral and manifests Laboratory workup includes complete blood count, as exopthalmos due to retro-orbital infiltration, is found in chemistries, and urine electrolytes if diabetes insipidus is 27% of ECD patients (20). Occasionally it may be resistant suspected. Imaging studies include magnetic resonance to treatment, requiring surgical debulking (21, 22). imaging (MRI) of the brain, a computed tomographic (CT) Xanthelasmas of the eyelids or the periorbital spaces were scan or an MRI of the entire aorta, a cardiac MRI, a CT scan also reported in 18% of the patients (20). of the chest, abdomen, and pelvis, and a transthoracic Diabetes insipidus is a characteristic endocrine echocardiography. An MRI of the spinal cord is only manifestation of ECD. It is secondary to hypothalamic or necessary if the patient has signs or symptoms of spinal cord pituitary infiltration, which may lead to other endocrinal involvement. abnormalities such as hyperprolactinemia or gonadotropin No clear staging, prognostic, or scoring system for insufficiency (20, 23). Haroche et al. reported in 2007 seven ECD has been established. It is suggested that 18F- cases of ECD with involvement of the adrenals. Diagnosis fluorodeoxyglucose positron-emission tomography (PET was established radiologically except for one case which was scan) and C-reactive protein elevation may predict disease confirmed via biopsy. However, only one case had activity (32, 33). A retrospective study of 31 patients with symptomatic adrenal insufficiency (24). Renal involvement ECD showed a variable sensitivity of PET scanning among is reportedly present in about 11% of ECD cases. Renal the different organs studied. However, in one study, its disease consists of obstructive uropathy due to specificity remained helpful in the assessment of CNS retroperitoneal fibrosis or renal histiocytic infiltration. involvement, as well as in the earlier detection of treatment Symptoms commonly include abdominal pain, dysuria and response as compared to brain MRI, and in the assessment possible development of hydronephrosis and renal of the cardiovascular system (32). 3258 Abdelfattah et al: Erdheim-Chester Disease: A Comprehensive Review Table III. Differential diagnosis of Erdheim-Chester disease and other types of non-Langerhans’ cell histiocytosis based on immunohistochemical staining. Disease (ref) CD68 CD1a S100 Factor XIIIa Other markers Erdheim-Chester disease (44) + − − + Birbeck granules absent Benign cephalic histiocytosis (45-47) + − − + Positive reaction for macrophage/leucocyte, HAM56 Generalised eruptive histiocytosis (48) + − − −/+ No reaction for CD34; positive reaction for MAC387, CD14, CD36 Indeterminate cell histiocytosis (49, 50) + + + − No reaction for CD3, CD4, CD8, CD20, CD36, CD79a Juvenile xanthogranuloma (51, 52) + − − +
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