Cubic measurements are THREE multiplied by one another. So, it is 2.15x2.15x?
. There should be three of them. It is not a perfect measurement of a tumor volume but it gives a good approximation. I bet they have software that measures the tumor's volume exactly. So, Irina's tumor measures 2.4x1.6x1.5 =5.76 cubic cm, well under 10. Mine was bigger but weirdly shaped.
Also, I should add that Dr.Sisti considers GK a failure if the tumor starts growing after 2 years. I did not ask how they distinguish between swelling and growth. Yes, radiation specialists usually talk about the tumor in cubic centimeters while neurosurgens are mostly concerned how much work they have to do to separate the tumor from the cranial nerves. So, 1.6 cm is less for them than 2.0 in any direction, for example. That has been my experience so far. I hope this information helps.
PS. I should also add that Dr. Isaacson pointed out that GK failures INCREASE as the tumor volume increases and approaches 10 cubic cm. After that, it is almost not worthwile (and dangerous of course) to do GK. That is why Dr. Sisti told me that I should make up my mind about GK ASAP because any tumor growth spurt will eliminate any chance of GK success. Surgery, he said, can wait and I did not have to do it immediately and safely postpone it for next year. I did exactly that. I saw him in August of 2006 and had surgery on June 27,2007.