الفهرس 
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Abstract
This study was conducted in Chest department, Beni-Suef university hospital, in the period from December 2017 to November 2018. It included 55 patients who are diagnosed as diffuse parenchymal lung diseases by HRCT chest.
The aim of the work was portraying patients having interstitial pneumonia with immune system features (IPAF) and characterizing its prognosis in contrast with other interstitial pneumonias and follow up those IPAF patients for diagnosing who will advance after some time to a definite CTD.
All patients were subjected to:
Complete history taking, Clinical examination, full routine labs, Arterial blood gases on ambient air, High resolution CT scan, spirometric testing, Transthoracic echocardiography with estimation of pulmonary artery systolic pressure and collagen profile testing.
We found that 31 patients met the criteria of IPAF and by studying their characteristics we found that.