Investigative Dermatology and Venereology Research | Volume 5 | Issue 1 | 2019-08-27

Vasculitis and Multitudes-Behcet’s Disease

Anubha Bajaj Consultant Histopathologist

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Preface Behcet s syndrome is cogitated as a systemic, variable vasculitis which incriminates the cutaneous and mucosal surfaces, arteries, veins, central nervous system and gastrointestinal system in concordance with articular and ocular manifestations. Behcet s disease is a chronic inflammatory disorder depicting several remissions and relapses. Behcet sdisease carries the nomenclature of Behcet syndrome or malignant aphthosis. Behcet s disease is cogitated as oculo- orogenital syndrome . It can be contemplated as an autoimmune disease [1] . Behcet s disease is a chronic condition demonstrating canker sores, ulceration in the mouth and genitals, inflammation in specific regions of the eye accompanied by arthritis, cutaneous manifestations, inflammation of digestive tract and central nervous system. Severe or progressive and relapsing apthous stomatitis can indicate the emergence of Behcet s disease, thereby necessitating extended monitoring, especially in individuals with a strong family history of the disorder [1,2] . Disease Characteristics: Behcet s disease is an inflammatory condition of obscure aetiology. Autoimmune reactions of Behcet s disease can be concurrent with herpes simplex viral infectionor bacterial infections due to streptococcus and staphylococcus species. Behcet s disease is usually cogitatedin genetically susceptible individuals, particularly carriers demonstrating HLA-B51 antigens. Behcet s disease is prevalent in subjects of Far Eastern and Mediterranean ancestries. Turkish individuals depict an enhanced incidence of Behcet s disease with the incrimination of 420 / 100,000 population. Behcet s disease is usually manifest along the old silk route and individuals implicated belong to Japan, China and Mediterranean region, whereas the condition is exceptional in the United States [2,3] . Subjects incriminated usually are within their twenties and thirties, although disease onsetcan occur at any age. Even as Behcet s disease is devoid of gender predilection, male predominance occurs in the Arab population and a female preponderance is cogitated in Korea, China, United States and North Europe. Individuals with an early onset of disease generally demonstrate an inferior prognosis. Ophthalmological and neurological complications preponderantly exemplify the morbidity associated with Behcet s disease. Additionally, prominent vascular and extensive gastrointestinal complications can be exhibited. Behcet s disease can be fatal on account of ruptured aneurysms or severe neurological complications [2,3] . Disease Pathogenesis: Cell mediated immunity is a pertinent factor in the elucidation of Behcet sdisease. Helper T lymphocytes type I are activated with a consequent augmentation of circulating levels of CD4+ lymphocytes and cytotoxic CD8+ lymphocytes within the peripheral blood. Aforesaid activated lymphocytes can target the oral mucosa, cutaneous surfaces,adjunctive visceraand systems accompanied by physiological manifestations. Several immunological modifications are enunciated in Behcet sdisease. Autoantibodies circulating within the peripheral blood are cogent against diverse tissue components such as intermediate filaments enunciated in the mucous membranes. Immune complexes disseminated within the peripheral blood can be deposited at specific pathological sites [3,4] . Declining complement levels appear within individual s peripheral blood. Aggregation of immunoglobulins and complement are cogitated within and surrounding the blood vessels. Evidently declining proportion of CD4+ to CD8+ T lymphocytes is exemplified. Nevertheless, thepredominant histological denominator enunciated is leukocytoclastic vasculitis which is contemplated as a characteristic morphological parameter of the disease. On account of association with immune complexes, Behcet s disease recapitulates several featuresconcurrent with adjunctive autoimmune diseases, particularly systemic lupus erythromatosus(SLE) which demonstrates an identical pathogenesis. Also, erythema nodosumcan be commonly manifested in aforesaid autoimmune diseases [2-4] . Clinical Elucidation: Clinical enunciation of Behcet s disease is contingent to specific geographic manifestations. Behcet s disease is characterized by reoccurrence of oral apthous ulcers accompanied by genital ulcerations, ocular manifestations such as uveitis and conjunctivitis and adjunctive systemic disorders. Subjects enunciating Behcet s disease typically demonstrate a history of reoccurring, painful, oral apthous ulcers with accompanying odynophagia, foul breath, photophobia, and loss of vision, painful joints and genital lesions. Certain coetaneous lesions can simulate acne and can occur comprehensively on the body surfaces. Erythema nodosum can also appear along with ulceration [5,6] . Multiple,oral apthous ulcers can appear in the soft palate, hard palate, buccal mucosa and tonsils. The ulcers depict a well defined, regular margin with a circumscribing bright-red halo and a grey-tinged substratum. Apthous ulcers arise within the mouth, particularly on sites such as lips, mucosa of the cheeks or tongue and appear in almost all of the implicated subjects. Aforesaid apthousulcers are numerous, frequent, enlarged and painful. Genital lesionsusually arise on the scrotum in males and vulva with vagina in females [5,6] . Ocular manifestationsincorporate conjunctivitis, uveitis and hypopyon. Retinal vasculitis or posterior ileitis is the typical ocular manifestation and enunciates the consequent emergence of blindness. Characteristic, non-crippling arthritis of medium-sized and large-sized joints is delineated in several instances. Aforesaid arthritis is non- erosive, asymmetrical, sterile and sero-negative for concordant autoimmune antibodies. Nevertheless, symmetrical and poly articular joint incrimination is frequently elucidated in Behcet s disease. Inflammation of jointswith accompanying manifestations commonly occur in a singular knee or ankle joint followed by a migratory monoarthiritis with a subsequent and simultaneous implication of bilateral joints, terminating with acomprehensive, all- prevailing joint involvement [6,7] . Neurological manifestations of Behcet s disease include meningo-encephalitis, cerebral venous thrombosis, benign intracranial hypertension, cranial nerve palsies and diverse pyramidal and extrapyramidal lesions. Gastrointestinal inflammation with fibrinoid necrosis and leukocytoclastic vasculitis is also a cogent component of Behcet s disease. Behcet sdisease characteristically displays arterial and venous thrombosis, although arterial incrimination is exceptional. Deep venous thrombosis can enunciate distended and tender calf muscles. Accompaniment of oro-genital ulcers and ocular lesions with aforesaid muscular inflammation indicates the emergence of Behcet s disease [7,8] . Histological Elucidation: Behcet s disease typically demonstrates an inflammation of arterial and venous blood vessels of varying magnitude. Preponderant histological features typifying Behcet sdisease are vasculitis and thrombosis. Tissue specimens from the muco-cutaneous lesions depict a predominant infiltration of neutrophils accompanied by distended endothelial cells and red cell extravasation. Leukocytoclastic vasculitis is an attribute indicative of Behcet s disease appearing in conjunction with fibrinoid necrosis confined to the surface of blood vessels. Morphological enunciation of leukocytoclastic vasculitis and panniculitis is noted in addition to superficial and deep-seated perivascular infiltrates of lymphocytes and neutrophils. A few blood vessels contain vascular thrombi [2,3] . Suppurative folliculitis can be exemplified along with intra-epidermal or sub-epidermal, fluid filled vesicles. Folliculo-sebaceous units can be disintegrated and encompassed with neutrophils. Vascular endothelial cells are distended. Perivascular inflammatory cellular infiltrate is enunciated composed of neutrophils and lymphocytes. Ancient lesions demonstrate a peri-vasculitis which is predominantly lymphocytic. However, a vascular reaction which is preponderantly constituted by neutrophils is cogitated as a characteristic inflammatory response of Behcet s disease. Incrimination of vasa vasorum as a component of vasculitis can exemplify the appearance of aneurysms within the large-calibre arteries [7,8] . Figure 1: Behcet s disease with neutrophilic infiltration of the blood vessels with fibrinoid necrosis of the vessel wall [11] . Figure 2: Behcet s disease with neutrophils enunciating vasculitis and foci of fibrinoidvasculitis [12] . Figure 3: Behcet s disease implicating the intestine with neutrophils abounding leukocytoclastic vasculitis and a perivascular lymphocytic egress [13] . Figure 4: Behcet s disease exemplifying myo-necrosis, fibrinoid necrosis of the vasculature and neutrophils dispersed within the necrotic tissue [14] . Figure 5: Behcet s disease confined to the intestine with prominent leukocytoclastic vasculitis and fibrinoidnecrosis of the vasculature [15] . Figure 6: Behcet s disease demonstrating intestinal inflammation with constituents of leukocytoclastic vasculitis and a perivascular lymphocytic infiltration [15] . Figure 7: Behcet s disease with vascular inflammation, disseminated neutrophils and fibrinoid necrosis of the vessels [16] . Figure 8: Behcet sdisease with disseminated intact and degenerated neutrophils and leukocytoclastic vasculitis [16] . Figure 9: Behcet sdisease with prominent leukocytoclastic vasculitis and intense fibrinoidnecrosis [16] . Figure 10: Behcet s disease with leukocytoclasticvasculitis and a perivascular lymphocyte sprinkling [16] . Figure 11: Behcet s disease with intense dissemination of neutrophils invading the blood vessel wall [17] . Figure 12: Behcet s disease with prominent fibrinoid necrosis, leukocytoclasticvasculitis and perivascular lymphocytes [17] . Differential Diagnosis: Demarcation of Behcet s disease is required from conditions such as Sweet s syndrome, erythema multiforme and pemphigus. Sacro-illitis with immune reactivity for HLA-B27 antigen is a condition necessitating segregation from Behcet s disease. A distinction from localized chronic fibrosing vasculitis is also mandated [2,3] . Investigative Assay: Behcet s disease can be appropriately discerned with clinical examination. Diagnostic criterion determines reappearing oral apthousstomatitis or ulcers in combination with two or more of clinical findings and an absence of associated systemic disease: Painful, relapsing genital ulcers, apthae or associated lesions. Ocular lesions such as retinal vasculitis or posterior uveitis. Cutaneous lesions such as erythema nodosum and papulo-pustularvasculitis appearing along with a positive Pathergy test which signifies the presence of a sterile pustule emerging subsequent to localized cutaneous trauma. Central nervous system lesions such as cerebral infarction or meningo-encephalitis. Uveitis with a lack of concurrent inflammatory bowel disease or collagen vascular disease [2,3] . Therapeutic Targets: Behcet s disease is a condition which typically exemplifies a remitting and relapsing clinical course. Therapeutic interventions are required to expeditiously suppress the inflammatory, systemic exacerbations and reoccurrences in order to prevent or delay organ damage. A multidisciplinary approach is essential for achieving optimal therapeutic outcomes. Therapy is preferably modified as per individual requirements and is contingent to age, gender, category and severity of incriminated organ damage and choice of the individual. Implication of ocular, vascular, neurological and gastrointestinal systems can depict an inferior prognosis [8,9] . Disease manifestations can ameliorate over a period of time, as is cogitated in several individuals. Behcet s disease appearing within cutaneous and mucosal surfaces with articular involvement can significantly impair the quality of life, although permanent deterioration and end-organ damage is absent. Inadequately managed ocular, vascular, central nervous system and gastrointestinal complications of Behcet s disease can engender serious systemic derangements ordeath [8,9] . Therapeutic Options: Treatment with systemic medication is required to prevent reappearance of Behcet s disease. Therapeutic strategies are contingent to site and severity of disease. Muco-cutaneous Behcet sdisease can be appropriately managed with topical antibiotics, topical corticosteroids and administration of sucralfate. Ocular Behcet sdisease requires topical corticosteroids and employment of mydriatic or cycloplegic agents. Articular Behcet s disease demonstrating arthritis is benefited with colchicine, non-steroidal anti inflammatory drugs(NSAID) and benzathine penicillin. Central nervous system and vascular Behcet s disease can be managed with systemic corticosteroids. Gastrointestinal Behcet s disease is treated with sulphasalazine and systemic corticosteroids [1,2] . Behcet s disease in pregnancy can preferentially be administered prednisolone and the systemic drug is devoid of pregnancy-related side effects. Male subjects delineating systemic incrimination as an initial, presenting symptom of Behcet s disease can be appropriately managed with systemic drugs [1,2] Instances of Behcet s disease are administered second and third line drugs: Immunomodulators such as azathioprine, cyclosporine. Immunosuppressive drugs such as methotrexate, cyclophosphamide. Anti tumour necrosis factor alpha exemplifying molecules such as infliximab. Surgical intervention forBehcet s disease is an ultimate therapeutic option to be adopted in instances of failure of medical therapy [1,2] . Extensive vascular incrimination with Behcet s disease is a variant maximally benefitted with surgical intervention in subject s refractory to medical management. A multidisciplinary management with the involvement of an expert and dedicated rheumatologist can exemplify superior therapeutic outcomes with enhanced quality of life [10] . Table: Recommendations of Additional Evaluation [1] Organ Implicated Therapeutic Comparisons Ocular manifestations Interferon- versusTNFis Evaluation of IL-1 and IL6 blockers Evaluation of safety and comparable efficacy of TNFis . Duration of administration of TNFis and interferon- following remission. Maintenance therapy or discontinued treatment for ocular complications. Efficacy of concurrent administration of glucocorticoids with interferon- Vascular manifestations Efficacy and safety of anticoagulation in prevention of relapsing venous thrombosis, post thrombotic syndrome and recurrent arterial occlusive events Optimal dose and duration of immunosuppressives after surgery for peripheral artery aneurysm Optimal treatment for postoperative recurrent anastomotic aneurysm(extra- anastomotic bypass versus local aneurysmal repair) Optimal therapy of intracardiac thrombosis Identification of aneurysmal variants ( saccular / diffuse/ fusiform /large vs small) to decide surgical options Nervous system manifestations Optimal treatment of initial, refractory and recurrent parenchymal nervous system involvement and cerebral venous thrombosis Role of MRI and adjunct investigations for therapeutic decisions and monitoring in nervous system involvement. Gastrointestinal manifestations Optimal treatment of initial, refractory and recurrent gastrointestinal incrimination Optimal role, dose and duration of corticosteroids in acute relapse and concurrent perforation Benefit and timing of control colonoscopy in clinical remission. Comprehensive evaluation Benefits of combination of immunosuppressives with TNFis Efficacy of treating side-effects such as fatigue IL: Interleukin,TNFis: Tumour Necrosis Factor Inhibitors, MRI: Magnetic Resonance Imaging. References 1. Hatemi, G., Christensen, R., et al. update of the EULAR recommendations for the management of Behest s syndrome. (2018) Ann Rheum Dis 1-11. Pubmed | Crossref | Others 2. Adil, A., Quint, J.M. Behcet Disease (2019) Stat Pearls. Pubmed | Crossref| Others 3. Dal, N.E., Cerci, P., et al. The role of vitamin D receptor in the pathogenesis of Behcet s disease: a case controlled study in Turkish population. (2019) Ann Hum Genet 83(3): 177-186. Pubmed| Crossref | Others 4. Emre, S., Guven-Yilmaz, S., et al. Optical coherence tomography angiography findings in Behcet patients. (2019) IntOpthalmol Pubmed | Crossref | Others 5. Hamza, N., Ben Sassi, S., et al. Stroke revealing Neuro-Behcet s disease with parenchymal and extensive vascular involvement. (2019) J Neural Sci 398: 131-134. Pubmed | Crossref | Others 6. Calik, A.N., Ozcan, K.S., et al The association of inflammatory markers and echocardiographic parameters in Behcet disease. (2019) ActaCardiol 28: 1-8. Pubmed | Crossref | Others 7. Kechida, M., Salah, S., et al Cardiac and vascular complications of Behcet disease in Tunisian context: clinical characteristics and predictive factors. (2018) AdvRheumatol 58(1): 32. Pubmed | Crossref | Others 8. Alibaz Oner, F., Karadeniz, A., et al. Behcet disease with vascular involvement : effects of different therapeutic regimens on the incidence of new relapses. (2015) Medicine. Pubmed | Crossref | Others 9. Seyahi, A., Cakmak, O.S., et al Clinical and ultrasonographic evaluation of lower extremity vein thrombosis in Behcet syndrome: an observational study (2015) Medicine. Pubmed | Crossref | Others 10. Tascilar, K., Melikoglu, M., et al. Vascular involvement in Behcet syndrome: a retrospective analysis of association and the time course. (2014) Rheumatology 53(11). Pubmed | Crossref | Others 11. Image1 courtesy : European Journal of Pharmaceutical and Medical Research Pubmed| Crossref| Others 12. Image 2 courtesy: Kitchen d cor club. Pubmed| Crossref| Others 13. Image3 courtesy ; Italian Journal of Paediatrics. Pubmed| Crossref| Others 14. Image4 courtesy : Semantic scholar. Pubmed| Crossref| Others 15. Image5 and 6courtesy : Science Direct. Pubmed| Crossref| Others 16. Image7, 8, 9,10courtesy: Springer link. Pubmed| Crossref| Others 17. Image11 and 12courtesy: eScholarship.com Pubmed| Crossref| Others