title: Metastatic angiosarcoma masquerading as diffuse pulmonary hemorrhage: clinicopathologic analysis of 7 new patients.
abstract: BACKGROUND
  Diffuse pulmonary hemorrhage is an uncommon presenting manifestation of angiosarcoma.
  
  
  OBJECTIVE
  To review the clinical, radiologic, and pathologic findings of patients with metastatic angiosarcoma who presented with diffuse pulmonary hemorrhage.
  
  
  METHODS
  Patients fulfilling inclusion criteria were identified from the consultation files. Clinical and radiologic data were obtained from referring pathologists. Histologic slides were reviewed in all patients.
  
  
  RESULTS
  Our patients included 6 men and 1 woman, aged 31 to 73 years; 4 patients were younger than 40 years. Six patients presented with hemoptysis, and all had diffuse abnormalities on radiographic studies. Clinical considerations prior to biopsy included pulmonary hemorrhage syndrome (n = 2), acute respiratory failure (n = 1), and infection (n = 1). Metastatic disease was included in the differential diagnosis in only 1 patient. None had a diagnosis of malignancy prior to lung biopsy. All biopsies showed hemorrhage associated with atypical epithelioid and spindle cells, forming anastomosing vascular channels, distributed along and within lymphatics and arteries. Neoplastic cells were immunoreactive for factor VIII-related protein or CD31 in all cases for which special stains were available. Three patients with complete follow-up died of their disease. Primary sites were discovered in all 3 patients who underwent autopsy examination. Two tumors arose in the heart and 1 in the pelvic soft tissues. One additional patient had a likely primary site identified in the right atrium by cardiac ultrasound and was subsequently lost to follow-up.
  
  
  CONCLUSIONS
  Angiosarcoma should be included in the differential diagnosis of diffuse pulmonary hemorrhage, especially in young adults.
authors.affiliation: Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA.
authors.forename: C
authors.initials: C
authors.lastname: Adem
authors.forename: M C
authors.initials: MC
authors.lastname: Aubry
authors.forename: H D
authors.initials: HD
authors.lastname: Tazelaar
authors.forename: J L
authors.initials: JL
authors.lastname: Myers
mesh_terms: D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor / Q000032:analysis; D003937:Diagnosis, Differential; D005260:Female; D006325:Heart Atria / Q000473:pathology; D006338:Heart Neoplasms / Q000473:pathology; D006394:Hemangiosarcoma / Q000737:chemistry / Q000473:pathology* / Q000556:secondary; D006469:Hemoptysis / Q000209:etiology; D006470:Hemorrhage / Q000473:pathology*; D006801:Humans; D008171:Lung Diseases / Q000473:pathology*; D008175:Lung Neoplasms / Q000737:chemistry / Q000473:pathology*; D008297:Male; D010388:Pelvis / Q000473:pathology; D019408:Platelet Endothelial Cell Adhesion Molecule-1 / Q000032:analysis; D012983:Soft Tissue Neoplasms / Q000473:pathology; D014841:von Willebrand Factor / Q000032:analysis
chemical_list: D014408:Biomarkers, Tumor; D019408:Platelet Endothelial Cell Adhesion Molecule-1; D014841:von Willebrand Factor