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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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More in this category: Retrieved from ” https: The presence of a significant number of another shape and size is recorded after the oblique stroke. The ILO does not take responsibility for content presented on this web portal that is presented in any language other than English, which is the language used for the initial production and peer-review of original content.

Diffuse pleural thickening might be divided into chest wall and diaphragm. From Wikipedia, the free encyclopedia. The Classification is based on a set of standard radiographs, a written text and a set of notes OHS No. By using this site, you agree to the Terms of Use and Privacy Policy. Irregular small opacities are classified by width as s, t, or u same sizes as for small rounded 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.

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.

Sincethe ILO has flassification published guidelines on how to classify chest X-rays for pneumoconiosis.

It deals with parenchymal abnormalities small and large opacitiespleural changes, and other features associated, or sometimes confused, with occupational lung disease. 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

For pleural thickening seen along the lateral chest wall the measurement of maximum width is made from the inner line of the chest wall to the inner margin of the shadow seen most sharply at the parenchymal-pleural boundary.

It is now extensively used internationally for epidemiological research, for the surveillance of those industry occupations and for clinical purposes. The “Complete Set” of standard x-rays consists of 22 radiographs: There are no features to be seen in a chest radiograph which are pathognomonic of dust exposure.

The presence of pleural thickening seen face-on is recorded even if it can be seen also in profile. Three sizes are defined by the appearances on standard radiographs: Definition of pleura is slightly imperfect. The possibility of deviating from the classification by over or under reading is so risky that his or her reading should not be used at least for epidemiological research or international comparability of pneumoconioses statistics.

If the thickening extends up the chest wall, then both costophrenic angle obliteration and pleural thickening should be recorded. Pleural abnormalities are also assessed with respect to location, width, extent, and degree of calcification. For mixed shapes or sizes of small opacities, the predominant shape and size is recorded first. If the reader attempts to classify a film without referring to any of the standard films, then no mention of reading according to the ILO International Classification of Radiographs should be made.

The ILO Classification system includes the printed Guidelines and sets of standard radiographs, available in both film and, as ofdigital forms. Some countries have established legal requirements for use of the Classification in the assessment of compensation claims, although the Classification was not originally designed for this purpose.

Calcification in small pneumoconiotic opacities. Coalescence of small pneumoconiotic opacities. Discussion in particular at the Seventh International Pneumoconioses Conference, held in Pittsburgh inindicated the need for improvement of some parts of the classification, in particular those concerning pleural changes.



In pneumoclniosis present manifestation of the ILO system, the reader is first asked to grade film quality. The pleural thickening present face on, is of indeterminate width, and extent 2.

Note shrinkage in lower lung fields. The purpose of the Classification was to describe and codify radiographic abnormalities of the pneumoconioses in a simple, systematic, and reproducible manner, aiding international comparisons of data, epidemiology, screening and surveillance, clinical purposes, and medical research. The letters p, q and r denote the presence of small, rounded opacities. Rheumatoid pneumoconiosis in left lower zone.

National Institute for Occupational Radiographd and Health.

Vascular pattern is well illustrated. Not associated small calcifications. Enlargement of hilar or mediastinal lymph nodes.

ILO Classification – Wikipedia

The “Quad Set” consists of 14 radiographs, nine of the most commonly used standards from the Complete Set, plus five radiogra;hs composite reproductions of quadrant sections from the other radiographs in the Complete Set.

Sincethe International Labour Organization [1] has been a specialized agency of the United Nationswith objectives including establishing and overseeing international labor standards and labor rights.

Am J Radiol; This is one example which explains why the ILO, in cooperation with many experts, has developed and updated on a continuous basis a classification of radiographs of pneumoconioses that provides a claxsification for recording systematically the radiographic abnormalities in the chest provoked by the inhalation of dust. Part of this programme is based on medical surveillance which includes the reading of thoracic radiographs to help diagnose this pneumoconiosis.

If a pleural thickening is circumscribed, it could be identified as a plaque.