Interstitial Fibrosis

Interstitial fibrosis is scarring of the interstitium, the thin web of tissue between the lung's air sacs where oxygen passes into the blood. As this tissue thickens and stiffens with scar, the lungs lose their stretch and can't transfer oxygen well, causing breathlessness and a dry cough. Asbestosis is a specific type of interstitial fibrosis caused by inhaled asbestos fibers.

Origin

Interstitial comes from the Latin interstitium, "a space between," and fibrosis from the Latin fibra ("fiber") with a suffix meaning a diseased condition. The terms entered medical use as microscopes revealed scarring in the tissue between the air sacs.

Significance in Asbestos Context

Interstitial fibrosis is the underlying process of asbestosis, and its pattern and distribution help doctors decide whether asbestos, rather than another cause, is to blame. On a CT scan it shows as reticular (net-like) markings, often with honeycombing in advanced disease, typically worse at the lung bases. Because many conditions cause interstitial fibrosis, doctors weigh the exposure history, the imaging pattern, and sometimes pleural plaques to attribute it to asbestos. The severity of fibrosis, measured by imaging and breathing tests, documents how the disease has affected the patient and supports a claim.

Example Sentence

His CT scan showed interstitial fibrosis at both lung bases with early honeycombing, which, combined with his shipyard history, supported a diagnosis of asbestosis.

Related Terms

Asbestosis, Honeycombing, Pulmonary Function Test, Pleural Plaques, High-Resolution CT, Reticular Opacities

Notes

• Ask whether a high-resolution CT (HRCT) was done; it shows fibrosis patterns far better than a standard chest X-ray.
• Pulmonary function tests, especially DLCO, quantify the impairment; keep these results, as they document severity over time.
• Fibrosis has many causes; make sure your doctors have your full occupational and exposure history so they attribute it correctly.