Interstitial lung disease specific to adulthood

Interstitial lung disease specific to adulthood (Orphanet code 264735) is a broad grouping category within the Orphanet classification that encompasses a heterogeneous collection of rare interstitial lung diseases (ILDs) that manifest primarily or exclusively during adult life. These disorders are characterized by inflammation and/or fibrosis of the lung interstitium — the tissue and space surrounding the air sacs (alveoli) of the lungs. The interstitium provides structural support to the alveoli, and when it becomes damaged or scarred, the lungs' ability to efficiently exchange oxygen and carbon dioxide is progressively impaired. Key symptoms shared across this group of diseases typically include progressive exertional dyspnea (shortness of breath with activity), persistent dry cough, fatigue, and in advanced cases, respiratory failure. Physical examination may reveal bibasilar inspiratory crackles ("velcro crackles") and, over time, digital clubbing. High-resolution computed tomography (HRCT) of the chest and sometimes surgical lung biopsy are important diagnostic tools. Pulmonary function testing typically shows a restrictive pattern with reduced diffusing capacity for carbon monoxide (DLCO). Because this is a classification grouping rather than a single disease entity, the treatment landscape varies considerably depending on the specific underlying diagnosis. Conditions falling under this umbrella may include idiopathic interstitial pneumonias (such as idiopathic pulmonary fibrosis, nonspecific interstitial pneumonia, and cryptogenic organizing pneumonia), hypersensitivity pneumonitis, sarcoidosis with pulmonary involvement, and other rare adult-onset ILDs. Treatments range from antifibrotic agents (pirfenidone, nintedanib) for idiopathic pulmonary fibrosis, to corticosteroids and immunosuppressive therapies for inflammatory forms, to lung transplantation in end-stage disease. Supportive care including supplemental oxygen and pulmonary rehabilitation plays an important role across all subtypes.

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