[Cardiac myxoma. Ultrastructural study of 2 cases].
From amongst a series of eight cardiac myxomas, two were studied by electron microscopy, which enabled us to identify, amongst varous cell types, two main ones. One of these was a secretory cell with Golgi apparatus and secretory vacuoles, and the other was of the expected type, with microfilaments showing signs of progressive differentiation towards either muscle or epithelial structure. A morphological picture of this sort tends to lend support to the concept of a dysgenetic origin for these tumours, arising from pluripotent embryonic cells sequestrated in the region of the fossa ovalis.
D000328:Adult; D000368:Aged; D003238:Connective Tissue / Q000648:ultrastructure; D003239:Connective Tissue Cells; D004721:Endoplasmic Reticulum / Q000648:ultrastructure; D005347:Fibroblasts / Q000648:ultrastructure; D006056:Golgi Apparatus / Q000648:ultrastructure; D006338:Heart Neoplasms / Q000648:ultrastructure*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008928:Mitochondria / Q000648:ultrastructure; D009206:Myocardium / Q000648:ultrastructure; D009210:Myofibrils / Q000648:ultrastructure; D009232:Myxoma / Q000648:ultrastructure*; D014617:Vacuoles / Q000648:ultrastructure
Myxome cardiaque. Etude ultrastructurale de deux observations