Lesion Score

A lesion score is a numerical rating that pathologists or radiologists assign to describe how extensive or severe a disease finding appears in tissue or on imaging. In asbestos-related disease, lesion scores are most often used to grade the extent of pleural plaques, pleural thickening, or interstitial fibrosis seen on CT scans, or to grade the severity of fibrosis and asbestos body counts in lung tissue samples.

Origin

The word "lesion" comes from the Latin laesio, meaning "injury" or "harm." Standardized scoring systems for asbestos-related lung and pleural findings developed alongside the International Labour Organization (ILO) classification for pneumoconiosis radiographs, first published in 1950 and revised repeatedly, and were later adapted for high-resolution CT scoring systems.

Significance in Asbestos Context

A lesion score puts a number on what would otherwise be a subjective description, which matters both medically and legally. Higher scores generally correlate with greater past asbestos exposure, worsening lung function, and in some cases a higher risk of progression, so the score may influence how aggressively your doctor monitors you and what treatments are considered. In a legal claim, lesion scores from your imaging or pathology reports can serve as objective evidence that your disease meets diagnostic criteria (such as the Helsinki Criteria) and can help quantify impairment for damages purposes. Defense experts often challenge scoring as observer-dependent, so consistent scoring by experienced readers carries more weight.

Example Sentence

The radiologist's report listed a lesion score for pleural plaque extent that supported the diagnosis of asbestos-related pleural disease.

Related Terms

ILO Classification, Pleural Plaques, Interstitial Fibrosis, Asbestos Bodies, High-Resolution CT (HRCT), Helsinki Criteria

Notes

• Ask your pulmonologist or radiologist which scoring system was used (ILO, ICOERD, or an institution-specific HRCT score) and request that the numerical score be entered into your medical record, not just a narrative description.
• Obtain and preserve the actual imaging files (DICOM discs), not just the written reports. Independent experts may need to re-score the images later.
• If you have serial scans, ask whether scores are trending upward; progression on a lesion score can support claims of worsening impairment.
• For pathology-based scores after biopsy or autopsy, ask whether asbestos body counts and fibrosis grading were performed, as these become important evidence in mesothelioma and asbestosis cases.
• Have your legal team retain a B-reader (a NIOSH-certified radiograph reader) when ILO scoring is central to your claim.