title: Pathologic quiz case: sacral/pelvic mass with lower back pain in a 36-year-old man. Immature plasmacytoma.
authors.affiliation: Department of Pathology and Laboratory Medicine, University of Medicine and Dentistry of New Jersey-New Jersey Medical School, Newark 07103, USA.
authors.forename: Xiao Yan
authors.initials: XY
authors.lastname: Yang
authors.forename: Meera
authors.initials: M
authors.lastname: Hameed
authors.forename: Eun-Sook
authors.initials: ES
authors.lastname: Cho
authors.forename: Kasturi
authors.initials: K
authors.lastname: Das
mesh_terms: D000328:Adult; D006801:Humans; D017116:Low Back Pain / Q000175:diagnosis*; D008297:Male; D010386:Pelvic Neoplasms / Q000175:diagnosis / Q000473:pathology*; D010954:Plasmacytoma / Q000175:diagnosis / Q000473:pathology*; D012445:Sacrococcygeal Region