Intracardiac myxoma.
Six intracardiac myxomas and 2 thrombi were subjected to scanning electron microscopy (SEM). Surface morphology of myxomas was distinct from thrombi. The surface of myxoma was either smooth or thrown into projections which had a continuous endothelial lining. This was lacking in thrombi. Cut surface of myxoma revealed the presence of round to polyhedral cells having blunt villi and/or pit-like depressions on their surface in a stroma of fibres, granular material and blood vessels. Thrombi were composed of blood elements enmeshed within fibres. No cells of the type encountered in myxomas were present.
D006325:Heart Atria; D006338:Heart Neoplasms / Q000473:pathology* / Q000648:ultrastructure; D006801:Humans; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning; D009206:Myocardium / Q000648:ultrastructure*; D009232:Myxoma / Q000473:pathology* / Q000648:ultrastructure