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

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: The ILO Classification system pertains to pulmonary parenchymal abnormalities pneumofoniosis and large opacitiespleural changes pleural plaques, calcification, and diffuse pleural thickening and other features associated, or sometimes confused, with occupational lung disease.

The flattening of the claszification should be recorded by an additional symbol since it is a very important feature in asbestos exposure.

Poor, with some technical defect but still acceptable for classification purposes. Despite all the national and international energies devoted to their prevention, pneumoconioses are still very present both in industrialized and developing countries, and are responsible for the disability and impairment of many workers. Three sizes are defined by the appearances on standard radiographs: Eggshell calcification of hilar or mediastinal lymph nodes.

The summary of the classification is given in table 2. Categories 1, 2 and 3—increasing profusion of small opacities as defined by the corresponding standard radiographs. The description of standard radiographs is given in table 1. Finally, other abnormal features of the chest radiograph can be commented upon ILO It is also used for describing and recording, in a systematic way, part of the information needed for assessing compensation.


The category of profusion is based on assessment of the concentration of opacities by comparison with the standard radiographs. The lower limit for this obliteration is defined by a standard radiograph.


They were identified according to the six zones—upper, middle and lower, io both right and left lungs. Pleural abnormalities are also assessed with respect to location, width, extent, and degree of calcification. The zones pneumoconioosis which the opacities are seen are recorded. Rheumatoid pneumoconiosis in left lower zone. Calcification in small pneumoconiotic opacities.

Large opacities are defined as any opacity greater than 1 cm that is present in a film. National Institute for Occupational Safety and Health. May 24, Content source: Pleural abnormalities diffuse pleural thickening, plaques and obliteration of costophrenic angle are also illustrated on different radiographs. Retrieved from ” https: Diffuse pleural thickening might be divided into chest wall and diaphragm. The “Quad Set” consists of 14 radiographs, nine of the most commonly used standards from the Complete Set, plus five additional composite reproductions of quadrant sections from the other radiographs in the Complete Set.

The scheme is designed for classifying the appearances of posterio-anterior chest radiographs. Classification Pneumodoniosis The Classification System includes the Guidelines and two sets of standard films. The presence of pleural thickening seen face-on is recorded even if it can be seen also in profile. classidication

CDC – Chest Radiography: ILO Classification – NIOSH Workplace Safety and Health Topic

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. Rate this item 1 2 3 4 5 0 votes.


The experts made the suggestion that the short classification is of no advantage and can be deleted. The obliteration of the costophrenic angle should be systematically noted whether it exists or not.

ILO Classification

The size of small round opacities is characterized as p up to 1. 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.

For mixed shapes or sizes of small opacities, the predominant shape and size is recorded first. Pleural thickening of the chest wall is recorded separately for the right R and left L thorax.

ILO International Classification of Radiographs of Pneumoconioses

The ILO Classification system includes the printed Guidelines and sets of standard radiographs, available in both film and, as ofdigital forms. Not associated small calcifications. Read times Last modified on Tuesday, 11 October Monday, 28 February Enlargement of hilar or mediastinal lymph nodes. The category of profusion is determined by considering the profusion as a whole over the affected zones of the lung and by comparing this with the standard radiographs.

The pleural thickening present in profile, is of width a, and extent 2.

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