Diffuse Pleural Thickening

Diffuse pleural thickening is widespread scarring and stiffening of the lining around the lungs, the pleura, that spreads over a large area rather than forming isolated patches. The scar tissue can wrap the lung and restrict how fully it expands, causing breathlessness. Unlike small localized pleural plaques, diffuse thickening often affects breathing and lung function.

Origin

The term comes from clinical radiology, where "diffuse" distinguishes widespread involvement from the discrete, localized pleural plaques also caused by asbestos. It entered common use as chest X-rays and later CT scans made the pattern recognizable.

Significance in Asbestos Context

For patients with asbestos exposure, diffuse pleural thickening is a recognized non-cancerous asbestos disease that can still be seriously disabling. It shows up on chest imaging as a continuous sheet of thickened pleura, sometimes with blunting of the angle where the lung meets the diaphragm (the costophrenic angle). Because it restricts lung expansion, it typically produces a "restrictive" pattern on breathing tests and can worsen over time. It matters legally because, unlike isolated pleural plaques, it often causes measurable impairment, which can support a claim for a non-malignant asbestos condition. Patients should have both imaging and pulmonary function testing to document how severe the impairment is.

Example Sentence

His CT scan showed diffuse pleural thickening encasing the lower lung, which explained why his breathlessness had steadily worsened.

Related Terms

Pleural Thickening, Pleural Plaques, Pleura, Pulmonary Function Test, Restrictive Lung Disease, Asbestosis

Notes

• Ask for both a CT scan and a pulmonary function test; imaging shows the thickening, breathing tests measure the disability it causes.
• Preserve serial X-rays and CT scans; comparing older and newer images documents progression.
• Ask your doctor to note whether the costophrenic angle is blunted, a feature that helps distinguish diffuse thickening from isolated plaques.