I half-remember some mainstream media article about a peculiar growth/tumor in which the vascular tissue itself had started to beat/pulse as if it were a sort of heart.
I cannot remember any other significant details about it, especially not whether this was unique or if more than one instance had been documented.
I am aware of teratomas and how they can develop into all sorts of different tissue (sometimes even multiple tissues in a single occurrence), but I had thought that these relegated themselves to other tissues more boring than cardiac tissue.
Am I misremembering this, or (more likely still) had science/medical reporting just conflated something, or have any such occurrences ever been documented?
I am curious for any details, though ideally someone can provide something closer to actual medical reports.