The ILO International Classification of Radiographs of Pneumoconioses is a system of Since , the ILO has periodically published guidelines on how to classify chest X-rays for pneumoconiosis. The purpose of the Classification was to. ILO Classification The International Labour Organization (ILO) is a specialized agency of the Radiograph showing Simple Coal Workers’ Pneumoconiosis. The object of the classification is to codify the radiographic . defect likely to impair classification of the radiograph of pneumoconiosis. 3, Poor.

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Category C — one or more opacities whose combined area exceeds the equivalent of the right upper zone. International Classification of Radiographs of Pneumoconiosisrev ed. In use, it provides a system for both epidemiological comparisons of many individuals exposed to dust and evaluation of an individual’s potential disease relative to established standards.

ILO International Classification of Radiographs of Pneumoconioses

The ILO International Classification of Radiographs of Pneumoconioses is a system of classifying chest radiographs X-rays for persons with a or, rarely, more than one form of pneumoconiosis.

The first classification was proposed for silicosis at the First International Conference of Experts on Pneumoconioses, held in Johannesburg in Large opacities are defined as any opacity greater than 1 cm that is present in pneumocniosis film. It is important to identify whether the costophrenic angle is visible or not.

The Classification System includes the Guidelines and two sets of standard films.

Honeycomb lung appearance is not marked. Diffuse pleural thickening might be divided into chest wall and diaphragm. Also shows vascular pattern, but not as clearly as example 1. The reader compares the classificatkon chest X-ray only the appearances seen on postero-anterior, or PA, chest x-ray with those of the standard set. This page was last edited on 9 Septemberat The object of the classification is to codify the radiographic abnormalities of pneumoconioses in a simple, reproducible manner.


Kerley lines in lower right zone. The revision of the classification of radiographs is a continuous ILO process, and a revised guideline should be published in the near future taking into account the recommendations of these experts.

ILO Classification

May 24, Content source: Definition of pleura is slightly imperfect. Links with this icon indicate that you are leaving the CDC website. Categories 1, 2 and 3—increasing profusion of small opacities as defined by the corresponding standard radiographs. Cancer of lung or pleura.

If pleural thickening is seen face-on only, width cannot usually be measured. Ina new classification based purely on radiographic changes was established Geneva classification The Guidelines for the use of the ILO International Classification of Radiographs of Pneumoconioses revised edition is the latest version of a well-established publication designed to standardize classification methods and facilitate international comparisons of pneumoconiosis statistics and research reports.

Facebook Twitter Email Syndicate. Coalescence of small pneumoconiotic opacities. Comments should be recorded pertaining to the classification of the radiograph, particularly if some other cause is thought to be responsible for a shadow which could be thought by others to have been due to pneumoconiosis; also to identify radiographs for which the technical quality may have affected the reading materially.


Each new version of the classification promoted by the ILO has brought modifications and changes based on international experience gained in the use of earlier classifications.

Enlargement of hilar or mediastinal lymph nodes. The maximum width usually occurs at the inner margin flassification the rib shadow at its outermost point. Pleural thickening in the interlobar fissure of mediastinum. The relevant text from the earlier edition is reproduced in this radiograpys, and the associated sets of standard radiographs remain available from the ILO.

Pleural abnormalities diffuse pleural thickening, plaques and obliteration of costophrenic angle are also illustrated on different radiographs. A full description of the classification, including its applications and limitation is found in the publication ILO The International Labour Organization ILO is a specialized agency of the United Nations that seeks to promote social justice and internationally recognized human and labor rights http: Summary of details of classification.


The Classification is based on a set of standard radiographs, a written text and a set of notes OHS No. The scheme is designed for classifying the appearances of posterio-anterior chest radiographs.

The flattening of the diaphragm should be recorded by an additional symbol since it is a very important feature in asbestos exposure. The obliteration of the costophrenic angle should clawsification systematically noted whether it exists or not.

The zones in which the opacities are seen are recorded. They are then asked to categorize small opacities according to shape and size.

It combined both radiographic appearances and impairment of lung functions. More in this forr The presence Y or absence N of costophrenic angle obliteration is recorded separately from thickening over other areas, for the right R and left L thorax.

This chapter extends the applicability of the ILO scheme to classifications of results from digital radiographic images of the chest. A physician must pass the certification examination to be a “B” reader. The film sets were new to coincide with the ILO Guidelines; the digital set is new and coincides with the Guidelines. The presence of a significant number of another shape and size is recorded after the oblique stroke.

Category B — one or more opacities larger or more numerous than those in category A whose combined area does not exceed the equivalent of the right upper zone.

Acceptable, with no technical defect likely to impair classification of the radiograph of pneumoconiosis. Not associated small calcifications.