Health Care

* Connected to the free silica dust accumulation crystalline form of silicon dioxide

* The characteristic anatomical lesion is silicosis nodule: up in the center of collagen fibers and hyalinized on the outskirts of a fiborconiotique crown (Dust seat)

* Exposed Professions Off-road work (mining, tunnel); abrasives industry; etching; exterior surfaces; ceramics manufacturing; dental technician

* Two types of opacities silicosis characteristics: small rounded opacities (<10 mm); extended opacity (> 1 cm); -> See ILO classification

Hilar lymphadenopathy * calcified in periphery “eggshell”

* Other: deformations of diaphragmatic; lucency bases (emphysema) …

* The scanner is useful (especially at an early stage)


* There is typically a restrictive syndrome often associated with the spread of disorder and obstructive syndrome.

* The first manifestations appear after a professional dustiness of 15 to 20 years

* Complications: tuberculosis; Aseptic necrosis of the tumor-like mass responsible for an array of mélanoptysie; transplant aspergillosis; spontaneous pneumothorax; chronic bronchial suppuration

* The scleroderma: systemic sclerosis silicosis +

* Syndrome Caplan: silicosis + RA


* Small rounded opacities: micro (between 1.5-3 mm);nodular (between 3 and 10 mm); punctate (<1.5 mm)

* These small opacities are always bilateral

– Category 1: few; visible in the sup parties. and Avg.

– Category 2: Many opacities, invading both lung fields

– Category 3: opacities very numerous, invading two lung fields

* Extended opacities; usually bilateral and roughly symmetrical

– Category A: single opacity <5 cm or more> 1 cm but the sum is <5 cm

– Category B: one or more opacities whose area does not exceed 1/3 of the right lung field.

– Category C: surface sum exceeds ⅓ of the right lung field

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