الفهرس 
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Abstract
Aim: This study was designed to recognize the sonographic features of interstitial lung diseases (ILD). And comparison of these features with the functional and radiological parameters of the disease were assessed.
Patients and methods: fifty-one patients with ILD were included; each patient underwent high resolution CT (HRCT), transthoracic sonography (TS), spirometry, DLco, 6-minute walk test with oxygen saturation assessment & MMRC dyspnea scale.
Results: significant statistical difference between patients with or without pleural line thickening in chest U/S as regard cystic changes in HRCT. statistical difference between patients with or without sub-pleural alterations as regard traction bronchiectasis in HRCT chest. significant statistical difference was found between patients with or without B lines with spacing less than 3 mm in chest U/S as regard ground glass in HRCT chest (p<0.001). significant statistical difference was found between patients with or without B lines with spacing less than 7 mm in chest U/S as regard ground glass (p=0.002), reticular infiltration (p=0.012) & traction bronchiectasis (p=0.019) in HRCT chest. As regard US chest findings & PFT: significant statistical difference between patients with or without pleural line thickening in chest U/S as regard the different severity grading of DLco (p=0.008); significant statistical difference between patients with or without pleural line thickening in chest U/S as regard FEV1 (p=0.015 & FVC (p=0.009).
Conclusion: TS can be used as an additional imaging method for assessment of ILD and as a marker to estimate the severity of disease.