title: A Case of Posterior Mediastinal Plasmacytoma Confounded by Community-Acquired Pneumonia.
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.
authors.affiliation: Department of Internal Medicine, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Dahee
authors.initials: D
authors.lastname: Heo
authors.affiliation: Department of Internal Medicine, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Ki Yung
authors.initials: KY
authors.lastname: Boo
authors.affiliation: Department of Internal Medicine, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Hyeyoung
authors.initials: H
authors.lastname: Jwa
authors.affiliation: Department of Internal Medicine, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Hwa Young
authors.initials: HY
authors.lastname: Lee
authors.affiliation: Department of Internal Medicine, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Jihyun
authors.initials: J
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Seong Taeg
authors.initials: ST
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Hye Mi
authors.initials: HM
authors.lastname: Seo
authors.affiliation: Department of Internal Medicine, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Sang Hoon
authors.initials: SH
authors.lastname: Han
authors.affiliation: Department of Pathology, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Young-Hee
authors.initials: YH
authors.lastname: Maeng
authors.affiliation: Department of Internal Medicine, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Jong Hoo
authors.initials: JH
authors.lastname: Lee
keywords: Diagnosis; Hematopoiesis, Extramedullary; Plasmacytoma; Pneumonia