The main aim of this study is to detect the value of transthoracic ultrasonography in the diagnosis and assessment of ILDs in correlation to chest X- ray, blood gases, pulmonary function test and echocardiography and to compare it with high resolution CT (HRCT) as a golden diagnostic investigation.

Interstitial lung disease (ILD) refers to a group of disorders that are characterized by varying combinations of inflammation and fibrosis involving the space between the epithelial and endothelial basement membranes.

Inclusion Criteria:

• Adults (≥18 years) diagnosed with ILD
• All patients must fulfil the 2018 criteria for HRCT chest finding for the diagnosis of Usual interstitial pneumonia (UIP) form

Exclusion Criteria:

• Patients with cardiac diseases (Left-sided Heart failure, pulmonary edema) [they may have findings of multiple B lines on transthoracic ultrasound examination which mimic ILD findings].
• Patients with chronic kidney diseases (as patients presented with nephrogenic pulmonary edema may have findings of multiple B lines on transthoracic ultrasound examination which mimic ILD findings).

Eligible patients will be recruited from the Department of Chest, Aswan University Hospital