About mesothelioma, all are true except

Malignant mesothelioma in thorax arises from either visceral or parietal pleura. There is increased incidence among people with heavy exposure to asbestos. There is a long latent period of 25 to 45 years so usually seen in late adulthood or middle age group. Malignant mesothelioma is a diffuse lesion that spreads widely in pleural space & is usually associated with extensive pleural effusion & direct invasion of thoracic structure hence it is more of diffuse nature rather being bilateral & symmetrical.