Haemosiderosis (Silico-Siderosis)

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XVI. Diseases Of The Respiratory System 194 Haemosiderosis (silico-siderosis) II-6.94 Lung: Is enlarged Diffusely-fibrotic: Rusty-red (iron-deposition) Pleura Is thickened N.B.I: Fibrosis, here, is more diffusing than nodular. The lesion is more in the upper half of the lung. The Prussian blue reaction for iron is positive in the brown-brick-red fibrosed areas. N.B. 2: Other types of dust diseases 1) Beryllium Pneumonitis: In those working with fluorescent lamps berylliosis. Acute pneumonitis: o A diffuse infiltration of lungs with oedema and haemorrhage; o (No polymorphs; only plasma cells). Delayed poisoning: o Chronic granulomatous lesions, the condition has to be differentiated from: . Miliary tuberculosis. Sarcoidosis. 2) Byssinosis: It is inhalation of cotton fibres little effect. 3) Bauxite fibrosis (Shaver's disease): Is caused by silica with aluminum. 4) Baggastosis: Is inhalation of cane-sugar fibres little effect. Emphysema (chronic, obstructive = so-called hypertrophic) Lung Voluminous (hence the old term "hypertrophic”). Is pale especially at: Apex Free borders Crackles and pits on pressure Shows multiple bullae Cut surface: Is swollen in many parts Dry as a meshwork (spongy structure) Semi translucent Shows: Bullae Anthracotic areas Bullae and vesicles: Appear mainly at : Apex Free borders Anterior margin Spaces (empty except for air) Are multiple (numerous) Variable in size and in shape Thin-walled Feathery Bloodless Paler than the remaining lung tissue N.B. 1 Emphysema may be classified into: 1. Acute: Vesicular (compensatory in origin). Interstitial (traumatic in origin). 2. Chronic: A) Generalized obstructive (so-called hypertrophic), due to loss of (or deficiency in) the elastic tissue of the lung and increase in the residual air content and the air trapped in the lung will inflate it. B) Localized (compensatory). 3. Senile: Is also termed atrophic. .

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