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Clarkson's estate passed through a series of heirs to the Maynard family, then at the end of 1945, AVM Forster Maynard sold it at auction at Sotheby's.

A brain AVM disrupts the vital exchange of blood between the lungs and heart.

It’s unclear what causes a brain AVM.

As a result of this suggestion, it has become known as the “Ave Maria Stone,” or the “AVM stone.”

In addition, the AVM Stone apparently also carries the runic date of 1363, which would conveniently connect it to the same event alleged to be recorded on the original Kensington stone.