This diagnostic image is an axial (transverse) computed tomography (CT) scan of the thorax at the level of the aortic arch, displayed in a mediastinal window. The image demonstrates hallmark signs of asbestos exposure through the presence of multiple, discrete pleural plaques. These plaques are highlighted with blue circles and appear as well-circumscribed, high-density (hyperattenuating) focal thickenings along the parietal pleura. Key anatomical landmarks include the central mediastinum containing the great vessels, bilateral dark air-filled lungs, and the surrounding thoracic cage with visible ribs and the posterior vertebral column. The plaques are distributed bilaterally along the lateral chest wall and in the paravertebral region, showing a characteristic plateau-like morphology and increased radiodensity compared to adjacent soft tissue, occasionally suggesting focal calcification. This finding is clinically significant for diagnosing asbestos-related pleural disease and serves as a radiological marker for prior occupational exposure, increasing the suspicion for associated conditions like mesothelioma or lung cancer.

This composite diagnostic image features three contrast-enhanced multidetector CT views (axial, coronal, and sagittal) of a 72-year-old male with a history of asbestos exposure, illustrating the staging of pleural mesothelioma. (a) The axial CT scan at the mid-thoracic level reveals diffuse, irregular, rind-like soft tissue enhancement causing marked pleural thickening that circumferentially encases the left lung. (b) The coronal reconstruction demonstrates a large, loculated pleural effusion in the left hemithorax and clear infiltration of the ipsilateral hemidiaphragm by the enhancing tumor mass. (c) The sagittal view highlights the invasion of the epicardial fat planes, characterized by a lack of distinct demarcation between the tumor and the pericardial layer. Key educational concepts include identifying the 'pleural rind' sign of malignancy, assessing transdiaphragmatic extension, and evaluating the loss of mediastinal fat planes to determine tumor resectability. These findings are consistent with advanced-stage pleural mesothelioma in the context of occupational exposure.

This frontal (posteroanterior) chest radiograph displays significant unilateral pathology of the right hemithorax in a 74-year-old male with a history of occupational asbestos exposure. Primary findings include a large right-sided pleural effusion causing basal opacification and obscuration of the right hemidiaphragm. Adjacent to the effusion, there is consolidation of the lung parenchyma, marked with an asterisk (*). Diffuse, irregular pleural thickening is evident along the right chest wall and apical regions (indicated by red arrows), accompanied by nodular pleural opacities (circled in red). Secondary features include notable right lung volume loss, resulting in a narrowed hemithorax and an ipsilateral shift of the mediastinum towards the right side. In contrast, the left lung appears relatively clear with preserved volume. These radiographic signs are highly suggestive of malignant pleural mesothelioma or advanced pleural disease related to asbestos exposure. This image serves as a clinical example for medical students and residents in radiology and pulmonology to identify signs of pleural malignancy and volume-contracting thoracic processes.

Imaging modality: Light microscopy of a paraffin-embedded, hematoxylin and eosin (H&E) stained lung tissue section. Anatomical context centers on the pulmonary parenchyma, specifically alveolar interstitium and alveolar macrophage-rich regions. Visual features include scattered ferruginous bodies—elongated, golden-brown rod fibers coated with an iron-containing shell—within macrophages and the interstitium, often appearing as dumbbell-like structures. The background may show mild interstitial inflammation and fibrosis consistent with asbestos exposure. Clinically, these histologic findings have high diagnostic significance when correlated with patient history and imaging: ferruginous bodies indicate prior asbestos exposure and raise index for asbestos-related disease, including asbestosis, lung carcinoma, and mesothelioma. This image is particularly relevant for exposure assessment in pathology, occupational health surveillance, and research on asbestos-related pathologies. If available, polarized light can enhance visualization of birefringent asbestos fibers and Prussian blue staining highlights iron in the coating. Overall, the image supports clinical risk stratification and informs management, surveillance strategies, and counseling for at-risk individuals.