title: Cytoplasmic fibrils in plasma cells of a solitary myeloma.
abstract: A 56-year-old woman had solitary plasma-cell myeloma in the right humerus. Six weeks after local irradiation therapy, she died from pulmonary alveolar hemorrhage and bilateral pleural effusion with malignant plasma-cell infiltration of the right atrium. Ultrastructural studies of the plasma cells from the myocardium demonstrated large bundles of prominent, non-branching, solid cytoplasmic fibrils in many cells. Each fibril had a width of 66--132 A, periodicity of 30--60 A, and a beaded appearance. These features suggest that the fibrils may be protein material, possibly an immunoglobulin.
mesh_terms: D001797:Blood Protein Electrophoresis; D001859:Bone Neoplasms / Q000648:ultrastructure*; D002466:Cell Nucleolus / Q000648:ultrastructure; D002467:Cell Nucleus / Q000648:ultrastructure; D002843:Chromatin / Q000648:ultrastructure; D003593:Cytoplasm / Q000648:ultrastructure*; D003599:Cytoskeleton / Q000648:ultrastructure*; D004721:Endoplasmic Reticulum / Q000648:ultrastructure; D005260:Female; D006801:Humans; D008875:Middle Aged; D008928:Mitochondria / Q000648:ultrastructure; D010950:Plasma Cells / Q000648:ultrastructure*; D010954:Plasmacytoma / Q000648:ultrastructure*
chemical_list: D002843:Chromatin