title: Atrial plasmacytoma and hypercalcemia.
abstract: OBJECTIVE
  To describe a patient with hypercalcemia due to multiple myeloma and an associated atrial plasmacytoma.
  
  
  METHODS
  A case report is presented with clinical and laboratory findings. We review the differential diagnosis of hypercalcemia and discuss multiple myeloma and plasmacytomas.
  
  
  RESULTS
  A 48-year-old woman presented to the emergency department with lethargy after sustaining trauma to the head. She was found to have a subdural hematoma and a parietal intraparenchymal hemorrhage. She had a serum calcium level of 17.2 mg/dL (normal, 8.4 to 10.6), anemia, thrombocytopenia, and renal insufficiency. Serum protein electrophoresis revealed a monoclonal gammopathy, and a bone marrow biopsy specimen was consistent with multiple myeloma. The patient required surgical evacuation of her subdural hematoma. Postoperatively, multiple complications developed, including a supraventricular tachycardia. She did not regain consciousness, and ventilatory support was withdrawn. On autopsy, she was found to have disseminated myeloma and an atrial plasmacytoma.
  
  
  CONCLUSIONS
  This case report emphasizes the need to consider a plasmacytoma as a manifestation of multiple myeloma when localizing symptoms are present.
authors.affiliation: Indiana University School of Medicine, Division of Endocrinology, Emerson Hall 421, 545 Barnhill Drive, Indianapolis, IN 46202, USA.
authors.forename: Lori A
authors.initials: LA
authors.lastname: Brame
authors.forename: Rohit
authors.initials: R
authors.lastname: Dwivedi
authors.forename: Todd W
authors.initials: TW
authors.lastname: Rice
authors.forename: Paul A
authors.initials: PA
authors.lastname: Skierczynski
mesh_terms: D001853:Bone Marrow / Q000473:pathology; D002543:Cerebral Hemorrhage / Q000175:diagnosis / Q000209:etiology; D006259:Craniocerebral Trauma / Q000150:complications; D003937:Diagnosis, Differential; D017809:Fatal Outcome; D005260:Female; D006325:Heart Atria; D006338:Heart Neoplasms / Q000150:complications / Q000175:diagnosis*; D006408:Hematoma, Subdural / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D006934:Hypercalcemia / Q000175:diagnosis* / Q000209:etiology; D008875:Middle Aged; D009101:Multiple Myeloma / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D010954:Plasmacytoma / Q000150:complications / Q000175:diagnosis*; D013154:Spleen / Q000473:pathology