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Asbestos related lung disease occurs after a prolonged period of exposure to it.
pleural & lung both may be involved including malignancy.
lung malignancy is also occurs after prolonged period of smoking.
The common causes of hemoptysis are lung malignancy,bronchiectasis
,valvular heart disease
,lung infarction etc.
in case of peripheral involvement of the lung bronchoscopy
fail to identify the cause.
IN these cases ct scan or thoracoscopy may be helpful.