Plasmacytomas are a localized proliferation of plasma cells in the bone marrow, and are less frequently seen in extraosseous organs or tissues. Extramedullary plasmacytoma is a rare malignant neoplasm, and is especially uncommon when it arises from the mediastinum. Here, we report on a case of posterior mediastinal extramedullary plasmacytoma in a 64-year-old man. He was admitted with an asymptomatic right apical mediastinal mass, which was provisionally diagnosed as a neurogenic mass. However, a subsequent investigation revealed that this tumor was a rare case of IgG kappa type extramedullary plasmacytoma arising from the posterior mediastinum. The patient was treated with local radiation to the mediastinum and is doing well without further evidence of disease.
[Show abstract][Hide abstract] ABSTRACT: In the chemical–mechanical polishing (CMP) of semiconductor structures, such defects as micro- and nano-scale scratches are frequently produced on the surfaces being polished. Recent research shows that not only agglomerated abrasives but the softer pad asperities in frictional contact also scratch the relatively hard surfaces. Accordingly, pad scratching is modeled based on the topography and mechanical properties of pad asperities. Asperity radius, Ra, and the standard deviation of asperity heights, σz, are identified as the key topographical parameters. The theoretical models and experimental results show that pad scratching in CMP can be mitigated by increasing Ra/σz.
[Show abstract][Hide abstract] ABSTRACT: Plasmacytomas are extramedullary accumulations of plasma cells originating from soft tissue. Mediastinal plasmacytoma is a rare presentation. A 67-year-old man recovered after antibiotic treatment for community-acquired pneumonia. However, on convalescent chest radiography after 3 months, mass like lesion at the right lower lung field was newly detected. Follow-up chest computed tomography (CT) revealed an increase in the extent of the right posterior mediastinal mass that we had considered to be pneumonic consolidations on previous CT scans. Through percutaneous needle biopsy, we diagnosed IgG kappa type extramedullary plasmacytoma of the posterior mediastinum.
Tuberculosis and Respiratory Diseases 07/2015; 78(3):262-6. DOI:10.4046/trd.2015.78.3.262
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