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  • Title: [Diffuse interstitial lung disorders in systemic diseases].
    Author: Kips JC.
    Journal: Verh K Acad Geneeskd Belg; 2003; 65(6):350-65. PubMed ID: 14964036.
    Abstract:
    Diffuse parenchymal lung disorders (DPLD) can develop in a variety of systemic disorders. Schematically grouped, these include connective tissue disorders, vasculitis, neoplastic disorders, sarcoidosis and a group of inherited or other rare miscellaneous disorders. This overview focuses on sarcoidosis, systemic sclerosis and Churg Strauss vasculitis. Pulmonary involvement occurs in more than 90% of all patients with sarcodosis. Grading into 4 stages is based on the chest radiograph. Forms characterised by an acute clinical onset or a low grade lung involvement have the highest spontaneous remission rate. The cause of sarcoidosis remains unknown. The diagnosis therefore is descriptive, based on the combination of clinical observations, chest X ray, and the histological documentation of non-caseating epitheloid granulomas in tissue biopsies. Treatment with steroids is only indicated if organ involvement leads to functional impairment. Lung fibrosis is the most important complication of both the "limited" and "diffuse cutaneous form" of systemic sclerosis, involving 90% of all patients. The histological pattern is that of "Usual Interstitial Pneumonia" (UIP) or "Non-specific Interstitial Pneumonia" (NSIP). The pathogenesis of the disorder is thought to consist of an abnormal, excessive regenerative response to an auto-immune mediated lung injury. Churg Strauss vasculitis is characterised by asthma, blood eosinophilia and vasculitis of the small vessels. The affected vessels wall shows signs of fibrinoid necrosis and are infiltrated by eosinophils. pANCA (anti-myeloperoxidase) is considered to play a role in the pathogenesis of the disease. Concern has risen that CysLT1 receptor antagonists might induce production of pANCA. To date, this has not been substantiated.
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