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Smoking-related interstitial fibrosis (SRIF) is an abnormality in the lungs characterized by excessive collagen deposition within the walls of the air sacs (interstitial fibrosis). This abnormality can be seen with a microscope and diagnosed by pathologists. It is caused by cigarette smoking. [1] [2]
Pulmonary fibrosis is a condition in which the lungs become scarred over time. [1] Symptoms include shortness of breath , a dry cough, feeling tired, weight loss, and nail clubbing . [ 1 ] Complications may include pulmonary hypertension , respiratory failure , pneumothorax , and lung cancer .
Respiratory bronchiolitis is a lung disease associated with tobacco smoking. [1] In pathology, it is defined by the presence of "smoker's macrophages". [1] When manifesting significant clinical symptoms it is referred to as respiratory bronchiolitis interstitial lung disease (RB-ILD). [1]
The median survival in idiopathic pulmonary fibrosis is 3-3.5 years. In those who receive a lung transplant, the medial survival in idiopathic pulmonary fibrosis is 5.2 years, as compared to 6.7 years in those with other types of ILD. [8] ILD is associated with a 3-fold increased risk of lung cancer. [8]
It is a type of chronic pulmonary fibrosis characterized by a progressive and irreversible decline in lung function. [6] [3] [4] The tissue in the lungs becomes thick and stiff, which affects the tissue that surrounds the air sacs in the lungs. [7] Symptoms typically include gradual onset of shortness of breath and a dry cough. [1]
Smoking-related interstitial fibrosis (SRIF) is another type of fibrosis that occurs in emphysematous lungs and can be identified by pathologists. Unlike CPFE, this type of fibrosis is usually clinically occult (i.e., does not cause symptoms or imaging abnormalities).
Appearance of usual interstitial pneumonia (UIP) in a surgical lung biopsy at low magnification. The tissue is stained with hematoxylin (purple dye) and eosin (pink dye) to make it visible. The pink areas in this picture represent lung fibrosis (collagen stains pink). Note the "patchwork" (quilt-like) pattern of the fibrosis.
Differential diagnosis includes non-specific interstitial pneumonia, pulmonary Langerhans cell histiocytosis, respiratory bronchiolitis-associated interstitial lung disease, and hypersensitivity pneumonia. DIP is primarily treated by quitting smoking, but it may not be enough in all cases.