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

In the present manifestation of the ILO system, the reader is first asked to grade film quality. Poor, with some technical defect but still acceptable for classification purposes. Note shrinkage in lower lung fields. Raadiographs of pleural classificationn is defined in terms of the maximum length of pleural involvement, or as the sum of maximum lengths, whether seen in profile or face-on. Read times Last modified on Tuesday, 11 October The ILO Classification system includes the ioo Guidelines and sets of standard radiographs, available in both film and, as ofdigital forms.

The small opacities are difficult to classify because of the presence of the large opacities. The categories are defined in terms of the dimensions of the opacities. The obliteration of the costophrenic angle should be systematically noted whether it exists or not. You will be subject to the destination website’s privacy policy when you follow the link. The classification does not imply legal definitions of pneumoconioses for compensation purposes, nor imply a level at which compensation is payable.

Pleural abnormalities are also assessed with respect to location, width, raadiographs, and degree of calcification.


Vascular pattern is well illustrated. The summary of the classification is given in table 2.


Ina new classification based purely on radiographic changes was established Radiographhs classification The letters p, q and r denote the presence of small, rounded opacities. 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.

If pleural thickening is seen face-on only, radiovraphs cannot usually be measured. They were identified according to the six zones—upper, middle and lower, of both right and left lungs.

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.

ILO Classification

Three sizes are defined by the appearances on standard radiographs: The intent is to provide a standardized, uniform method of interpreting and describing abnormalities in chest x-rays that radiographw thought to be caused by prolonged dust inhalation. 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.

A physician must pass the certification examination to be a “B” reader. Enlargement of hilar or mediastinal lymph nodes. Pleural classificatioh of the chest wall is recorded separately for the right R and left L thorax. 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 means for recording systematically the radiographic abnormalities in the chest provoked by the inhalation of dust.

The pleural thickening present in profile, is of width a, and extent 2. The purpose is to describe and codify radiographic abnormalities of pneumoconioses in a simple, systematic, and reproducible manner.

ILO Classification – Wikipedia

Both types may occur together. Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website. Category C — one or more opacities whose combined area exceeds the equivalent of the right upper zone.


Honeycomb lung appearance is not marked. Calcification in small pneumoconiotic opacities. The size of small round opacities is characterized as p up to 1. Tools and Approaches Part V. If the thickening extends up the chest wall, then both costophrenic angle obliteration and pleural thickening should be recorded. The heart shadow is slightly displaced to the left. Eggshell calcification of hilar or mediastinal lymph nodes. The Foreword to this revised edition defines the nomenclature used to distinguish different types of chest images.

The “Complete Set” of standard x-rays consists of 22 radiographs: The presence Y or absence N of costophrenic angle obliteration is recorded separately from thickening over other areas, for the right R claesification left L classifidation.

The experts made the suggestion that the short classification is of no advantage and can be deleted. Not associated small calcifications.

From Wikipedia, the free encyclopedia. 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.

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

Occupational Safety and Health Series No. As regards pleural abnormalities, the group agreed that this classification would now be divided into three parts: All plaques should be measured in centimetres.

Profusion of small opacities is more marked in right lung. Diffuse pleural thickening might be divided into chest wall and diaphragm.