A primary cardiac spindle cell tumor with immunoreactivity for keratin
proteins is reported. Cytogenetic analysis of the tumor demonstrated
a translocation (X;18), an aberration almost exclusively reported in s
ynovial sarcomas. Postmortem examination revealed amphibole asbestos w
ithin the lungs and diaphragmatic pleural plaques indicative of asbest
os exposure. These findings raise questions about the possible causati
on of this tumor.