<prompt> A 48 years old man, resident of Baroda outskis near a textile mill presents to his family physician with respiratory symptoms. Doctor advices X Ray chest which showed - fine reticular nodular pattern in lower zone with loss of clarity of diaphragm cardiac shadows. He also doubts about the presence of small pleural effusion. The probable diagnosis is?StannosisAsbestosisSilicosisCoal workers pneumoconiosis  <response>: B i.e. Asbestosis - Asbestos related lung disease presents with pleural effusion small, blood stained, persistent, recurrent, bilateral, pleural plaques bilateral, multifocal, exclusively involving parietal pleura along posterolateral lateral chest wall bw 6-10th ribs and sparing visceral pleura, apices costophrenic angles, pleural calcification bilateral diaphragmatic calcification with clear CP angles is pathognomic, diffuse pleural thickening involves visceral pleura 1t impaired lung function, asbestosis, pseudotumor round atlectasis malignancy. - Asbetosis may present with fine to coarse reticulonodular pattern causing loss of clarity of diaphragm cardiac shadow Shaggy hea on x ray. HRCT investigation of choice shows subpleural pulmonary arcade, pleural based nodular irragularities, parenchymal bands septal lines Round atelectasis occurs mostly in peripheral, lower, dorsal posterior lobes adjacent to visceral pleuraQ and presents with Comet taiVVaccum cleaner Crows feet sign and Swiss cheese air bronchogramQ Predilection for Lower ZoneQ Whole lung may be involved with predominant lower zone involvement Asbestosis Related Lung Disease: Asbestos is the generic term used for heat resistant fibrous silicates. They are classified into 2 groups. 1 Straight, rigid, needle like Amphiboles eg commercial crocidolite blueblack asbestos amosite brown asbestos; and non- commercial contaminating amphiboles such as actinolite, tremolite anthophyllite; 2 Serpentines nonamphiboles such as commercial chrysolite white asbestos. - Aspect length-to-diameter ratio decides carcinogenicity. Amosite crocidolite are relatively malignant, whereas anthophyllite, chrysotile and tremolite are benign. - Apa from pleural effusion, which may be present as early as 5 years post exposure, the typical abnormalities do not appear until 20 years or more after initial exposure. - Dt asbestos, exposure may occur in asbestos industry, ship building textile 