الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Interstitial lung diseases are regarded as a mixed group of diseases with idiopathic and known etiologies. Four patterns of abnormal opacity are caused by ILD on chest radiographs and CT scans are linear, reticular, nodular, and reticulonodular. CT more accurately and specifically can define these patterns. The concluding diagnosis of ILDs involves a combination of radiological, clinical, and sometimes pathological information. Pulmonary hypertension (PH) is a common complication of interstitial lung diseases (ILDs), remarkably in idiopathic pulmonary fibrosis and ILD related to connective tissue diseases. Pulmonary hypertension (PH) has been defined as a mean pulmonary artery pressure of at least 25 mmHg at rest measured by right heart catheterization (RHC). However, data from normal subjects have stated that a mean pulmonary artery pressure more than 20 mmHg is considered as abnormal pressure. The recent clinical classification revealed five major groups, depend on hemodynamic and pathological characteristics, we alerted on group 3 PH associated with ILD that is also called idiopathic pulmonary arterial hypertension. Regardless of its etiology, the diagnosis of pulmonary arterial hypertension is vital because of its interrelation with terrible prognostic predictors.