[Diagnostics of Interstitial Lung Diseases - Practical Instructions with a Focus on Rheumatologic Systemic Diseases].

Interstitial lung diseases (ILD) are etiologically heterogeneous with unknown and known causes like rheumatologic systemic diseases differing in their therapeutic and prognostic consequences. In consensus between pulmonologists, rheumatologists, radiologists, and pathologists, we developed practical instructions for ILD diagnosis in rheumatologic systemic diseases, in particular because ILD can present in early stages of rheumatic systemic diseases. ILD diagnosis is based on clinical assessment results including a detailed medical history, physical examination, focused laboratory tests, radiology with a high-resolution computed tomography, lung function, and histopathology also to differentiate it from cardiac and infection associated lung diseases. The ILD diagnosis is made in a multidisciplinary discussion leading to therapeutic and prognostic consequences. The occurrence of acute exacerbations is especially critical. They are often the causes for ILD progression and are associated with considerable mortality.