title: Lack of identifiable vascular invasion in patients with extranodal dissemination of Hodgkin's disease.
mesh_terms: D001706:Biopsy; D001808:Blood Vessels / Q000473:pathology*; D006689:Hodgkin Disease / Q000175:diagnosis / Q000473:pathology*; D006801:Humans; D009362:Neoplasm Metastasis / Q000175:diagnosis*; D011379:Prognosis; D013194:Staining and Labeling