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Pathology - Malignant mesothelioma
It is a malignant tumor originating in the pleura from mesothelial cells, characterized by a diffuse growth pattern throughout the pleural surfaces.
Epidemiology • The majority of occurrences occur in males over 60 years of age. • The incidence continues to increase owing to the prolonged incubation period between asbestos exposure and tumor formation.
• The incidence is anticipated to reach its zenith between 2015 and 2020.
Aetiology Over 90% of instances can be directly linked to asbestos exposure. Amphibole asbestos is the most potent kind, succeeded by chrysotile, and subsequently amosite. • Additional potential causes encompass non-asbestos mineral fibers and therapeutic radiation.
Pathogenesis • Inhaled asbestos fibers stay permanently lodged in the lung. • The majority do not elicit a tissue response, and they are likely the fibers responsible for carcinogenic effects. A minority become enveloped in iron, resulting in the formation of asbestos bodies.
Presentation • Dyspnea, frequently resulting from a significant unilateral pleural effusion, accompanied by thoracic pain. • Marked weight loss and malaise are commonly observed.
Macroscopy • Initially, several tiny nodules are observed on the parietal pleura. • As the tumor progresses, the nodules coalesce to create a tumor mass that envelops the entire lung and adheres to the chest wall.
Cytopathology • Epithelioid mesotheliomas are more prone to disseminate into pleural fluid, where malignant cells are observed organizing into sheets, clusters, and papillae.
Histopathology • Epithelioid mesothelioma consists of spherical cells that create tubules and papillae. Sarcomatoid mesothelioma consists of elongated spindle-shaped cancerous cells. Biphasic mesothelioma comprises a combination of epithelioid and sarcomatoid variants. Desmoplastic mesothelioma is a variation characterized by a limited number of malignant cells embedded in highly dense collagenous tissue.
Prognosis: Extremely unfavorable
It is a malignant tumor originating in the pleura from mesothelial cells, characterized by a diffuse growth pattern throughout the pleural surfaces.
Epidemiology • The majority of occurrences occur in males over 60 years of age. • The incidence continues to increase owing to the prolonged incubation period between asbestos exposure and tumor formation.
• The incidence is anticipated to reach its zenith between 2015 and 2020.
Aetiology Over 90% of instances can be directly linked to asbestos exposure. Amphibole asbestos is the most potent kind, succeeded by chrysotile, and subsequently amosite. • Additional potential causes encompass non-asbestos mineral fibers and therapeutic radiation.
Pathogenesis • Inhaled asbestos fibers stay permanently lodged in the lung. • The majority do not elicit a tissue response, and they are likely the fibers responsible for carcinogenic effects. A minority become enveloped in iron, resulting in the formation of asbestos bodies.
Presentation • Dyspnea, frequently resulting from a significant unilateral pleural effusion, accompanied by thoracic pain. • Marked weight loss and malaise are commonly observed.
Macroscopy • Initially, several tiny nodules are observed on the parietal pleura. • As the tumor progresses, the nodules coalesce to create a tumor mass that envelops the entire lung and adheres to the chest wall.
Cytopathology • Epithelioid mesotheliomas are more prone to disseminate into pleural fluid, where malignant cells are observed organizing into sheets, clusters, and papillae.
Histopathology • Epithelioid mesothelioma consists of spherical cells that create tubules and papillae. Sarcomatoid mesothelioma consists of elongated spindle-shaped cancerous cells. Biphasic mesothelioma comprises a combination of epithelioid and sarcomatoid variants. Desmoplastic mesothelioma is a variation characterized by a limited number of malignant cells embedded in highly dense collagenous tissue.
Prognosis: Extremely unfavorable
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