New X‑ray Score Tracks Tuberculosis Progress and Predicts Risk

Tuberculosis (TB) remains a disease where knowing how a patient is doing over time can be hard to judge from routine tests. Chest X‑Rays (CXRs) are widely available, but interpreting subtle changes and turning them into objective measures of disease progression has been a challenge for clinicians. Cristina Vilaplana and colleagues set out to build a practical radiological index that could put numbers on what radiologists see on standard CXRs, so that disease progression and response to treatment could be tracked more reliably. Their goal was to create a tool that captures both active and inactive signs of pulmonary TB, to follow patients during treatment and later follow‑up, and to test whether that tool is useful in real patient groups. Using anonymized serial CXRs from patients with pulmonary TB, the team developed a scoring system aimed at classifying radiological patterns and measuring changes over time. The work was designed not only to produce a reproducible score but also to validate it in an independent cohort, so that the findings would be more robust and relevant to clinical care.

The researchers created the RUTI‑TB Evolution Score, abbreviated RTBES, and evaluated it in two separate patient groups. The first cohort consisted of a pseudonymized sample of serial CXRs from 21 TB patients at the Perinatal HIV Research Unit (PHRU) in South Africa. The score was then validated in a larger, independent cohort of 50 treated TB patients drawn from the National Institute of Allergy and Infectious Diseases (NIAID) TB Data Portals. Observers applied the index to CXRs to identify and classify patterns associated with active and inactive TB. The RTBES showed strong reproducibility, with 95.96% interobserver agreement within plus or minus 2 points. In both cohorts, scores that reflected active TB signs decreased over the course of follow‑up, indicating that the index tracked treatment evolution. Higher baseline RTBES values were associated with male sex, higher bacterial loads, and more extensive lung involvement including cavitation and pleural effusions. Importantly, a baseline RTBES of 2 or greater predicted unfavourable outcomes: 80% of failures or deaths occurred in patients with scores above that threshold.

The RTBES offers a straightforward way to turn routine Chest X‑Rays into quantitative measures of disease severity and change over time. Because it captures both active and inactive radiological features and proved reproducible across observers and two independent patient groups, the score could become a tool for clinicians to monitor progress, assess risk early, and support decisions during treatment and follow‑up. Its ability to predict unfavourable outcomes when baseline scores are at or above 2 suggests it might help flag high‑risk patients who need closer attention or different management. The decrease in active‑sign scores over follow‑up in both cohorts also supports the RTBES as a way to measure response to therapy using standard imaging. While further work beyond these cohorts would be needed to explore implementation in different settings, Cristina Vilaplana and colleagues demonstrate that a validated radiological index can make CXRs more informative for patient care and prognosis in pulmonary TB.