According to Dameshek, true polycythemia (polycythemia vera: PV) is a chronic myeloproliferative disorder of the total bone marrow without any evidence of invasiveness, in which erythrocytosis, leukocytosis, and thrombocytosis are all simultaneously present.
However, in patients suffering from connective tissue disease or lung cancer, chest pain may persist for long periods. What Causes Pleurisy? Pleurisy may occur inhealthy, young people who have an infection in the lungs caused by bacteria or virus. Pleurisy may last a few days or up to two weeks. In rare cases, the infection may spread, causing pleurisy in other people. Pleurisy may also be associated with air leaking in the pleural cavity from a punctured lung, a condition called pneumothorax.
Causes of pleurisy. Pleurisy is inflammation of the pleura. It's usually caused by another condition, such as an infection, but sometimes no cause can be identified.The pleura are two thin sheets of tissue that separate the lungs and ribcage. One is attached to the ribcage and the other is attached to the lungs.auses of pleurisy. Pleurisy is inflammation of the pleura. It's usually caused by another condition, such as an infection, but sometimes no cause can be identified.